Many people claim to be interested in another Avengers movie, when we all know they're actually going to see the master of the cameo, Stan Lee.  Audi has come out with a hilarious video celebrating his cameo mastery as he teaches a class to the next generation:

robot6.comicbookresources.com/2015/04/stan-lee-teaches-cameo-school-in-hilarious-audi-tv-spot/