The website Buzzfeed.com has put together a great list of 25 Celebrities You Never Knew Were In Old, Corny Commercials. And yes, there are videos to go along with them.
Ben Affleck in a Burger King commercial
Steve Carell in an ad for Brown's Chicken
Tina Fey in a bad, bad haircut pimping Mutual Savings Bank
Lindsay Lohan in a Bill Cosby Jell-O commercial
Kristen Stewart acting like she enjoys something for a change in a Porsche ad.
Naomi Watts singing the praises of Tampax
(Check out the whole bunch here.)