4) “The Other Guy Spit It Out” – The Incredible Hulk
You’ll remember that in The Avengers, Bruce Banner reveals that he tried to commit suicide by putting a bullet in his mouth, but “the Other Guy spit it out.” This seems like a hint at an unseen dark point in the character’s past, but actually this is a reference to the abandoned opening to The Incredible Hulk where that exact thing happened.
Back when he looked like Edward Norton instead of Mark Ruffalo (I suppose changing your form so much might realign your facial features?), Bruce does the deed while up in some snowy mountains. It can be presumed that it was decided that the opening was too dark for a family-orientated superhero film, so it was replaced.
As an added bonus, in the avalanche that ensues, none other than Captain America can be glimpsed – in the bottom left of the screen (go on, have a really good look)!