The bromance between Tony Stark (aka Iron Man) and Bruce Banner (aka The Hulk) is one for the ages, especially among chatty Marvel fans. Ever since Tony and Bruce started geeking out over the scientific aspects of the Tesseract in The Avengers, fans have adored their on-screen chemistry. Even Jimmy Kimmel got in on the Science Bros ship when presenting fan art, in varying degrees of bromance and true romance, to the cast on a recent episode of Jimmy Kimmel Live!

Speaking of The Avengers on-screen chemistry, Clint Barton/Hawkeye and Natasha Romanoff certainly made sparks fly fighting with and against each other. Fans want to know all about what went down between them in Budapest.

Arguably the two most decent, pure-hearted, and “worthy” of the bunch, Thor and Captain America’s bromance has the brawn to match the Science Bros’ brains. Plus, Steve Rogers may in fact be the only other person worthy of wielding Thor’s hammer, Mjolnir.

Also known as Stony and Stark and Stripes, the coupling stems from Steve and Tony’s often tense relationship. Some fans run with their heated interactions, creating fan works of their opposites-attract romance.

Sure, Loki and Thor are brothers albeit not by blood. Still, that hasn’t stopped some fans from “shipping” the brothers/frenemies with one another. Even a Chinese movie theater got duped into thinking Thorki, as the ship is also known, was real—printing a fan made poster of Thor embracing Loki to promote Thor: The Dark World.

Sam Wilson/Falcon and Natasha Romanoff/Black Widow hit it off in Captain America: Winter Soldier. Too bad they had an international coup on their hands before they could really get to know each other

Bucky Barnes and Steve Rogers’ WWII-era bromance emphasizes that even as Captain America, he’s still the good friend he’s always been. Though Bucky Barnes returns as the brainwashed adversary Winter Soldier, he is still one of Steve’s last ties to his life before being frozen for about 65 years and waking up to modern times.

The love affair between Tony Stark and Pepper Potts reminds viewers that Iron Man does indeed “have a heart.” While Pepper isn’t putting Tony into place in every Marvel film featuring Iron Man, her presence is nevertheless felt as she represents what (and who) Iron Man is fighting for.

Trailers and sneak peeks of The Avengers: Age of Ultron seems to hint that the connection between Natasha and Bruce plays a significant part in how the heroes fare against Ultron and their own internal conflicts. Sorry, Clintasha shippers, it looks like this pair is the heart of the next chapter for The Avengers.

Agent of S.H.I.E.L.D. Clint Barton a.k.a. Hawkeye once worked with Agent Phil Coulson, as briefly seen in Thor, but some fans dream about their past missions together. Often called S.H.I.E.L.D. Husbands, this ship is quite popular in fan fiction communities even though Hawkeye and Coulson have hardly shared any real screen time.

Before Science Bros, there was Iron Bros. When old pals Tony Stark and James Rhodes don their weaponized metal suits, they become Iron Man and War Machine, respectively. Through thick and thin, this bromance stays ironclad.

Jane Foster first meets an exiled Thor Odinson in the middle of the New Mexico desert, and the rest is history. Without Jane, Thor wouldn’t have learned humility and compassion nor would he be worthy to wield his mighty hammer. Without Thor, Jane wouldn’t have gained crucial insights into her astrophysics research. Plus, they get to kiss sometimes—win, win.

He couldn’t leave his best girl! Peggy Carter and Steve Rogers may be the greatest Marvel romance that never had a chance. While we love seeing them do their own things in Agent Carter and The Avengers movies, respectively, their star-crossed love story still breaks our hearts. Excuse us while we re-watch their reunion in Captain America: Winter Soldier and mend our broken hearts.

Rhodey and Pepper’s friendship grew from their mutual friendship, admiration, and frustration with the one and only Tony Stark. As Tony Stark/Iron Man’s best allies, Rhodey and Pepper also support each other as seen in Iron Man 3.

Some fans love shipping this pair almost as much as Agent Phil Coulson admires his longtime role model, WWII hero Captain America. The question remains: When will Cap ever learn that the leading man of ABC’s Agents of S.H.I.E.L.D. isn’t actually dead (anymore)?