By Chris Nashawaty
October 15, 2010 at 04:00 AM EDT

With her chowdah-thick Massachusetts accent in Conviction, Hilary Swank is the latest A-list actor to pahk the cah in Hahvahd Yahd. And it’s not always easy on the ears. Hence, our evaluation.

Amy Ryan, Gone Baby Gone (2007)
After Ryan read for the part, director (and Boston native) Ben Affleck asked her what part of Boston she was from. Her answer: Queens. Yes, she’s that good.

Leonardo DiCaprio, Shutter Island (2010)
Practice makes pretty good (if not quite perfect) as Leo dusts off the Bay State honk he used in 2007’s The Departed. We can’t say the same for costar Mark Ruffalo.

Julianne Moore, NBC’s 30 Rock (2009-10)
Moore is such a great actress. We can’t figure out what happened. Was her accent intentionally awful or did she just watch Rob Morrow in Quiz Show too many times?

Robin Williams, Good Will Hunting (1997)
As a Southie shrink with a heart of gold, Williams has a Cliff Clavin squawk that’s like a knitting needle to the eardrum. The fact that he won an Oscar for it is downright bizahh.