Here are four from last year. First up, Dennis Quaid (click on each picture for a closer look), who's apparently made of rubber and plastic, which probably came in handy when he filmed the 2009 G.I. Joe movie.
Leslie Mann is one of the stars of Funny People. And she is a funny person, but here she just looks funny.
Samuel L. Jackson has appeared in approximately 5,861 movies in the past two decades. That kind of schedule would stress out anyone, which is probably why Jackson looks like he's about to eat the football he's holding in the photo below. Take a half-decade vacation, Shaft 2000—you've earned it.
Hilary Swank is known for her big grin, a la Julia Roberts, but on the cover of USA Weekend hers looks smaller than the other three celebrities'. She doesn't deserve another Oscar for this particular feat, but it's impressive nonetheless.
Finally, this picture of action director Michael Bay (Armageddon, Pearl Harbor, and the two Transformers movies, with a third on the way) wasn't taken for USA Weekend—it merely appeared inside the June 19-21, 2009, issue as part of an ad for M&M's. It doesn't require Bay to show a big, toothy grin either, but since it actually does portray him as a cartoon, it's worth mentioning, especially since his cinematic crimes against humanity make me fantasize about seeing him crushed under a shoe on the floor of a movie theater.