I would cry! Stan Lee is the backbone of Marvel, his cameos show us how invested he is in his love for Marvel and that he's just as much a fan of our amazing superheroes as we are. (It's sad to think that my best post on here is about Stan Lee dying.
I just wanna movie where Stan Lee just becomes like a main character, and he just gathers all the avengers and says, "I've been watching you for years." And they all just gape and Tony is just staring at him and Stan says, "You too Tony Stank.