cameos

7. Neil Patrick Harris ("Harold and Kumar Go to White Castle") He may have overplayed his hand by the third installment, but NPH's original cameo in "White Castle," playing a women-chasing, drug addicted, sex-crazed hitchhiker version of himself was hilarious. The role was only enhanced when he came out of the closet two years later, making the version he plays of himself that much more far-fetched and comically inaccurate. 6. Tom Cruise ("Tropic Thunder") You know it's a good cameo when the random guy sitting next to you in the movie theater doesn't say a word to you until Tom Cruise's big dance number at the end of the film, when he turns to you and says "Holy shit! Is that Tom Cruise?" ...

It's hard to decide what makes a cameo "the best." Sometimes it's how surprising and absurd it is. Other times, it's how incredibly funny or even sexy it makes the scene. And some cameos can be considered great because of how lame or extraordinarily unnecessary they are. For this list, we've decided not to discriminate, tossing in a mixed bag in order to ensure entertainment of all our readers one way or another. 15. Billy Zane ("Zoolander") Clearly Billy Zane always has Derek Zoolander's back wherever he goes. But it doesn't matter, because ol' Derek couldn't be any less appreciative. For shame. Billy Zane's a cool dude. (Other notable cameos in this film include David Bowie, Vince Vaughn, ...