Best: Johnny Depp
Famous for playing weirdos and people who act/look like Keith Richards, Johnny Depp is actually one heck of a nice guy. For instance, in addition to helping blast Hunter S. Thompson's corpse into the stratosphere (per his last wishes), he also gave a $4,000 tip to a waiter at Gibsons Steakhouse in Chicago after the server accommodated the actor's group into the wee hours of the night. That almost makes up for Transcendence. Almost.
Worst: Jeremy Piven
You might think "Yeah, this makes sense" when you see some of the people on this list, and Jeremy Piven, the guy who made his name by playing a giant d-bag, is definitely one of them. The dude must be some kind of Brando-esque method actor, because at bougie Aspen sushi joint Nobu, Piven decided to leave his server a gift instead of cash. And that gift was a signed Entourage: Season 1 DVD -- which is the third-least-desired gift in the world, closely trailing anthrax and a medically induced enema.