Truly great actors know the key to their craft is watching other more famous actors and then shamelessly aping them.

<strong>8. Josh Brolin</strong>- Movie: Planet Terror
Mimics: Nick Nolte
From the grizzled chin pubes to the long, greasy hair to the "I just woke up hungover five minutes ago" line delivery, the eldest Goonie channels Breakfast of Champion's Nolte to perfection. Nolte is the only other person who could look at an emergency room full of puss-oozing zombies and react with all the terror of someone who just noticed a scratch on his car door. "Aw, Christ…another go

<strong>7. Viggo Mortensen</strong>- Movie: G.I. Jane
Mimics: Christopher Walken
"I never saw a wild thing sorry for itself…" For years, Hollywood has blown out its birthday candles wishing for an actor who looked like Ed Harris but sounded like Christopher Walken. Viggo's performance as Master Chief Urgayle was so Walken-ian, he could have (a la Pulp Fiction) held a gold wristwatch in front of Demi Moore's face and told her, "I kept this uncomfortable hunk of metal up my ass two years," and you wouldn't have flinched.

<strong>6. Larry the Cable Guy</strong> - Movie: Health Inspector
Mimics: Randy Quaid
Vacation. Christmas Vacation. Vegas Vacation. Independence Day. The only thing Randy Quaid failed to do with his dipshit redneck shtick was power it into his own headlining gig (and no, Christmas Vacation 2: Cousin Eddie's Island Adventure doesn't count). Enter Larry the Cable Guy. This guy has essentially taken Quaid's shtick and used it to become the biggest thing to hit the Bible belt since ignorance and automatic weapons. And where's Randy? That was rhetorical.

<strong>5. Ren&eacute;e Zellweger</strong>- Movie: Cinderella Man
Mimics: Betty Boop
Someone should have beefed up Renée's 1930s research materials with something other than old cartoons. Her helium-pitched New Yawk accent didn't reflect a single human being who lived through the Depression, but it was a dead-on impression of the balloon-headed 2-D tramp Boop. For that matter, someone should have told Ron Howard that Max Baer actually didn't eat babies and shoot puppies in betwee

<strong>4. Ben Affleck</strong>- Movie: Boiler Room
Mimics: Alec Baldwin
Remember Bugsy Malone, that movie where there was a bunch of little kids acting like tough gangsters? Well, since Boiler Room was a pre-K version of Glengarry Glen Ross, it's no wonder Affleck delivers a watered-down, pre-pubescent version of Baldwin's classic castrating sales lecture. Affleck's about as intimidating as a male nurse, so the effect is, let's say, less intense than the stare-down from Alec's Blake. Hey, Ben, put that coffee down.

<strong>3. Kenneth Branagh</strong>- Movie: Celebrity
Mimics: Woody Allen
One often overlooked law of nature goes as follows: In the absence of a Woody Allen, an alternate Woody Allen must take its place, lest the universe collapses in on itself. So even though Soon-Yi's sugar daddy stayed on the sidelines, the Hollywood Ending star essentially used Branagh the way a ventriloquist uses a wooden dummy. The twitchy hands, the stammering line delivery, the brainy quips—it was like Woody was wearing Branagh as a skin suit.

<strong>2. Christian Slater</strong>- Movie: Heathers
Mimics: Jack Nicholson
Really, this one's a lifetime achievement award. Christian's been playing Lil' Jack his entire career, but nowhere is it more on the nose than in Heathers. The eyebrows, the wry, smirking delivery, the constant hanging around cheerleaders—it's Jack through and through. Why these two have never played father and son, we can't figure. Maybe 'cause Jack would have stepped on set like his Departed mob boss, said, "Knock it off, kid," and Christian's career would have ended much sooner.

<strong>1. Heath Ledger</strong>- Movie: Lords of Dogtown
Mimics: Val Kilmer
The only way Ledger could have acted any more like Kilmer is if he had picked a fist fight with the director and then bad-mouthed the film during press junkets. Ledger took a hint of Val's Jim Morrison from The Doors, a hint of Val's Chris Shiherlis (from Heat, noob), and probably a hint of Val's New Mexico homegrown, stank-ass weed (the latter we have no actual proof of), and spun it

<strong>9. Michael Rosenbaum</strong>- Movie: Kickin' It Old Skool
Mimics: Chevy Chase
In Old Skool, Smallville's Lex Luthor plays a smarmy dickhead who stomps on the dreams of coma victim Jamie Kennedy—so, of course, Rosenbaum wisely studied the master. Before he became an unbearable douche, Chevy was the king of double talk (Fletch, anyone?). Rosenbaum's overly tanned, teeth-whitened TV host could easily have been played by Chevy if Old Skool came out 20 years ago and, you know, had any intention of being good.