Worst accents in a mainstream movie

This is a spinoff from the Departed thread (which actually hits the Boston accent fine) ...

Worst accents in a movie? Like for Boston, I think of Rob Morrow in "Quiz Show" ... and having seen the trailer for "Blood Diamond," I'm not sure Leo can pull off his South African English dialect better than anybody in "Lethal Weapon 2" did.

 

Borat.

 

I think Tony Curtis in Spartacus is generally acknowledged as the worst accent in a major movie.

 

Kevin Costner in JFK.

 

Maggie in Caddyshack. I think it's supposed to be Irish. I'm not sure.

 

Marlon Brando in The Godfather.

 

I think someone's going to pay you a visit ...

 

See, here's where you're wrong. Kevin Costner *always* does a great Kevin Costner accent.

Doesn't matter if he's playing a New Orleans D.A. ... or an Iowa farmer ... or a white-trash golfer ... or a futuristic aquatic superhero ...

 

I thought Leo and Cameron in Gangs of New York were bad.

 

Fixed that for ya, Doc.

 

Cameron Diaz was terrible.

 

Tony Curtis played an Arab prince once, didn't he? And yes, his accent in Spartacus was laughable.

The other day I was watching The Great Escape and was struck by James Coburn's hideous attempt at an Australian accent. Appalling.