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Think you know the CBS sitcom? Time to find out.
Think you know The Big Bang Theory? Time to separate the fans from the super fans.
Watch The Big Bang Theory on CBS All Access: Try It For Free!
Come on, you've got this ...
Watch The Big Bang Theory on CBS All Access: Try It For Free!
OK, that was an easy one, right? Now you're ready for the real deal.
Watch The Big Bang Theory on CBS All Access: Try It For Free!
Plus, she's a neurobiologist. What a smarty pants.
Watch The Big Bang Theory on CBS All Access: Try It For Free!
That would be the prestigious California Institute of Technology.
Watch The Big Bang Theory on CBS All Access: Try It For Free!
The more you know!
Watch The Big Bang Theory on CBS All Access: Try It For Free!
Sheldon revealed to Penny that as a child he walked in on his dad having sex with another woman. Now he knocks three times because two or three knocks "are for people to get their pants on."
Watch The Big Bang Theory on CBS All Access: Try It For Free!
He's a Trekkie, through and through.
Watch The Big Bang Theory on CBS All Access: Try It For Free!
Penny's obsession with the game in Season 2 eventually prompts her to throw away her laptop.
Watch The Big Bang Theory on CBS All Access: Try It For Free!
"Kal El" is Superman's real name on Krypton.
Watch The Big Bang Theory on CBS All Access: Try It For Free!
Not to be confused with Serial Ape-ist 2: Monkey See, Monkey Kill.
Watch The Big Bang Theory on CBS All Access: Try It For Free!
Did you know that one? Keep going...
Watch The Big Bang Theory on CBS All Access: Try It For Free!
LOL, of course it is.
Watch The Big Bang Theory on CBS All Access: Try It For Free!