Everybody has to start off somewhere. The following list features successful actors all got their start in advertising. If you're feeling like you are stuck in a dead end job, just remember it could be the doorway to something great.
SNES Ad featuring Paul Rudd.
A very young (and skinny) Jack Black in a commercial for the classic game, Pitfall.
Steve Carrell in a late 80s to early 90s Brown's Chicken ad.
Keanu Reeves giving the performance of his career in a late 80s Corn Flakes commercial.
A very young Brad Pitt lending his talents to promote Pringles.
George Costanza himself. Jason Alxeander is featured in this so-cheesy-you-can-taste-it McDonald's commercial from the 80s.
Bruce Willis promoting Seagram's wine coolers. I just love the fact that Willis was a ladies man long before he was a successful actor.
Okay, so these commercials were filmed after Nicolas Cage became successful...ish, but I just couldn't resist showing these thoroughly crazy, thoroughly Nicolas Cage Japanese commercials promoting Pachinko. The craziest/creepiest moment for me happens right around the 1:15 mark. Enjoy.