The harshest critics of these projects? The actors in the credits!

Chevy Chase

"It's a f--king mediocre sitcom!" the Community actor, 68, fumed to show creator Dan Harmon in a voice mail.

Charlize Theron

The star, 36, dissed 2000's flop Reindeer Games as "a bad, bad movie." But, she added, "F--k regret!"

Mark Wahlberg

"You can't blame me for wanting to play a science teacher!" joked the actor, 40, of 2008 dud The Happening.

Megan Fox

Ripping 2009's Transformers sequel, Fox, 25, confessed, "I didn't know what was happening."