[PJ-Comix]

I also remember George Plimpton doing a horrible job as a Western bad guy. I also really enjoyed "The Blue Max" but George Peppard was way too American to convince me that he was German. Come to think about it, I never did buy Richard Burton as Leon Trotsky. Epic fail there too.

[rintense]

Brad Pitt in everything except 12 Monkeys.

Ben Affleck in everything he's been in.

[sleddogs]

Sondra Locke in The Outlaw Josey Wales, The Gauntlet, Bronco Billy, Any Which Way You Can, Sudden Impact. UGH

[DemforBush]

My short list:

-Rosie O’Donnell as Betty Rubble in one of the Flintstones movies. Every guy (whether they will admit it or not) who ever watched the cartoon had a childhood fantasy of what a real-life Betty would look like. I guarantee you none of them ever thought of Rosie O’Donnell.

-Sharon Stone in the remake of Gloria. Gena Rowlands you ain’t, baby.

-Brad Pitt as Achilles in Troy.

-William Shatner as Alexander the Great (TV pilot). A pre-Trek Shatner and his loyal sidekick (a pre-Batman Adam West) fight off the Persians.

-And, last but not least: Jack Palance in CHE! as...wait for it..Fidel Castro.

[Revolting cat!]

Frances Ethel Gumm in anything!

[randita]

Elizabeth Taylor as “Cleopatra”.

[The_Sword_of_Groo]

Denise Richards as a scientist in The World is not Enough.

[Kevmo]

I always thought William Shatner wasn’t a very good actor, that whole Star Trek crew was lucky to get their parts and even luckier to have the fan base grow. Luckily for us, Galaxy Quest came out as proper satire.

[mardi59]

Jane Fonda in Barbarella, Streisand in Yentl, Tom Hanks in Joe vs the Volcano, Meg Tilly in anything, Al Pacino in Scent of a Woman, Tom Cruise in TAPS.

[Colonel Kangaroo]

I've always thought that Faye Emerson, FDR's daughter-in-law, was remarkably consistent in producing bad performances. But I think her worst of all was her cameo in 1943’s Air Force playing the wounded girlfriend of the hero in a painful hospital scene.

[kanawa]

Tom Cruise in Magnolia

[synbad600]

I've got it! The worst acting ever: the first gas station attendant in Wayne's World (before Charlton Heston stepped in.)

But then again, he could have been acting like a bad actor, which would make him a really good actor.

[Holen1]

Dennis Quaid, as Doc Holliday, in Wyatt Earp.

[william clark]

Two come immediately to mind:

Lou Gossett Jr. in Jaws 3(-D)
Willem Dafoe in Boondock Saints

[ropin71]

Keanu Reeves in Speed tops my list

[qam1]

All the actors in the Lord of the Rings Trilogy

The “Shark in the Pond” girl in Jaws, thankfully we never heard from her again

[Betis70]

John Travolta, “Battlefield Earth”

[SJSAMPLE]

ANYTHING with a (c)rapper.

[PrincessB]

Maxwell Caulfield in Grease 2
Diane Lane in The Outsiders

[Awgie]

Julia Roberts in anything that tries to portray her as a “pretty woman.”

[ConservativeStatement]

What about Sofia Coppolla in Godfather 3.