Big Hero 6
Damm! This is harder than I expected.
Fantastic Four 2.
Avengers
All those cameos are fun, but Stan the Man has actually been playing Uatu the Watcher the whole time - always around, watching .... not being noticed... (or Thanos's master spy or something...)
Indeed a tough call. But I liked his cameo in Spider-Man 3 the best. "You know, I guess one person can make a difference. 'Nuff said."
Every day is a gift, not a given right.
CBR just had an article about Stan doing more cameos:
http://www.cbr.com/stan-lee-filmed-f...os-in-one-day/
I said before he's actually the Watcher, but if that's a FF legal thing, then maybe he's actually playing those mechanized Recorders....