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There really is no one like Sheldon Cooper, is there?

Glenn Gaslin
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1 of 25 Robert Voets/CBS

1. That time he tore up the dance floor

Mr. Cooper is full of surprises. During a night out with Amy, Penny and Bernadette, Sheldon let it slip that he's actually pretty good on his feet.

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2 of 25 Cliff Lipson/CBS

2. That time he trained Penny like a dog

When Penny started spending way more time in Sheldon and Leonard's apartment, she annoyed Sheldon -- who, in turn, attempted to change her personality using positive reinforcement in the form of chocolate.

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3 of 25 Sonja Flemming/CBS

3. That time he slept with a geology textbook

Sheldon says that geology is "the Kardashians of science." So, when Sheldon found himself hungover in bed with his geology textbook, he definitely felt the "shame" in "walk of shame."
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4. ​That time he hid in a ball pit

Sheldon broke into a ball pit hoping the plastic spheres would help him solve a physics problem. When Leonard came to pick Sheldon up, Sheldon narrowly escaped him by hiding in the balls.

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5 of 25 Michael Yarish, Warner Bros.

5. That time he realized he loved Taylor Swift

When creating a sound mix to keep his anxiety up (which included The Joker's laugh, Godzilla's roar and Darth Vader's breathing), he discovered that adding T. Swift didn't make him anxious like he hypothesized.

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​6. That time he dressed up like a French maid

When Howard was asked to work with Stephen Hawking, he took full advantage of Sheldon's love of the noted physicist. He made Sheldon polish his collection of belt buckles, do his laundry and, best of all, wear a French maid's outfit.

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7 of 25 Richard Cartwright/CBS

7. That time he broke up with Amy and got a lot of cats

After breaking up with Amy, Sheldon went full-on cat lady and acquired Dr. Robert Oppenheimer, Enrico Fermi, Richard Feynman, Edward Teller, Otto Frisch and Zazzles.

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8. ​That time he was undead

In "The Good Guy Fluctuation," Sheldon got spooky with his "bazinga" by popping out of the couch cushions to scare Leonard.

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​9. That time he used math to make friends

Sheldon created the friendship algorithm, which was a flowchart based on a children's book called Stu the Cockatoo Is New at the Zoo, to try and befriend colleague Barry Kripke. Unfortunately, Sheldon got stuck in a loop in his algorithm until Howard bailed him out.

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​10. That time he got naked in Howard's car

When Howard was given Sheldon's parking spot without his consent, Sheldon became hell-bent on getting it back. Sheldon takes his parking spot so seriously that he was willing to push through his germophobia to sit in Howard's car in the buff.

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11 of 25 Chuck Zlotnick/CBS

11. That time his World of Warcraft account got hacked

Sheldon had a panic attack when his World Of Warcraft account was hacked. When he discovered that his wand of untainted power, his gold, and his battle ostrich were stolen, he called the police to report an actual robbery.

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12. ​That time he found the acoustic sweet spot

The Sheldon Cooper method of finding the perfect spot in a movie theater involves moving to different seats around the theater and yelling out "HA!" to test the acoustics.

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13. ​That time he flipped out on Howard's moped

Sheldon doesn't drive and can't take the bus because there are no seat belts (and they won't let him use bungee cords anymore). When Leonard couldn't drive him home because he had to work late and Penny couldn't stand being his chauffeur, Sheldon was left with one choice: Howard's moped. It went about as well as you could imagine.

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14 of 25 Cliff Lipson/CBS

14. That time he went to jail

After insulting a judge, Sheldon was thrown in jail. Once he saw the state of the communal toilet in the cell, however, he told the jailer that he was willing to apologize.

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15 of 25 Ron Batzdorff/Warner Bros.

15. That time he was literally the Doppler effect

Sheldon showed up to a Halloween party in a black-and-white striped ensemble that was supposed to be the Doppler effect. Unfortunately, at a party filled with Penny's acquaintances, everyone thought he was a zebra.

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​16. That time he was actually romantic

After Amy broke things off with Sheldon, he got "Darlin'" by The Beach Boys stuck in his head. This caused him to realize that there's no one for him but Amy.

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​17. That time he drank coffee for the first time

Don't give Sheldon coffee. We repeat: DON'T GIVE SHELDON COFFEE. After chattering away about theoretical physics for hours on end, Sheldon took full advantage of his Flash costume and excess energy and ran circles around the apartment.

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18 of 25 Michael Yarish, Warner Bros.

18. That time he tried his hand at seduction

Sheldon tried to seduce Amy by turning on his inner lothario. He was unsuccessful, but his flamenco dance almost got to Amy. Can you blame her?

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19. ​That time he sang "Soft Kitty" to Penny

After Penny dislocated her shoulder, Sheldon was there to her to make her feel better. It turns out he's got a soft side under all of those neuroses!

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20. ​That time he became a biohazard

In his quest for a non-germ lifestyle, Sheldon was exposed to what we can only assume was a pretty gnarly airborne pathogen. On the bright side, Sheldon got to play "Mystic Warlords of Ka'a" with Leonard, Raj and Howard, all in Hazmat suits.

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21 of 25 Robert Voets/CBS

21. That time he made himself a robot

Sheldon created a robot that could go out into the world for him so that he could stay safe in his bedroom. Because of his sense of impending doom, he missed out on meeting Steve Wozniak at the Cheesecake Factory.

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​22. That time he smiled... kind of

When Leonard asked Sheldon to smile, Sheldon flashed various forms of what can only be described as "murderous clown grimaces." All versions were terrifying, but everyone agreed that the closed mouth smile was the least scary.

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23 of 25 Michael Yarish/Warner Bros.

23. That time he played bongos

Why would Sheldon play bongos? Well, apparently Richard Feynman, one of America's most important theoretical physicists, who was responsible for the theory of quantum electrodynamics, played them. Duh.

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24 of 25 Sonja Flemming, CBS

24. That time he was under the influence

When Howard slipped a handful of Valium into Sheldon's warm milk, we learned that Sheldon can't keep any secrets when he's high, not even that his mother smokes cigarettes and that he is, in fact, Batman.

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25 of 25 Michael Yarish, Warner Bros.

25. That time he saw his mom doing it

Unfortunately for Sheldon, he witnessed his mother doing the dirty and was scarred. When Howard asked him what happened, he responded with, "I saw my mommy with a naked man and she was trying to be a mommy again."

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