Video: There are some things you can count on to always be there, and the Stan Lee movie cameo is definitely one of them. If the Marvel universe is all connected, then Stan's gone from being mistaken for Hef to a delivery man in the course of it. I'd watch a movie explaining that.
Image: Big Hero Six, Disney
Or, in the Marvelverse, there are a dozen or so people who all look alike wandering around. One or the other.
This supercut covers them all except for the most recent Doctor Strange cameo. But ending on Tony Stank does feel right.