Dear rappers: Please. Stop. Acting.

LL Cool J

The Mistake: "Deep Blue Sea"

Scenario: Super intelligent and super hungry sharks chomp scientists in wetsuits.

Rapper-Turned-Failure: Mr. Cool J plays chef Sherman "Preacher" Dudley on the undersea research vessel. Somehow a shark gets in his kitchen, and he tries to fight it off with a tiny axe with mixed results. Don't call it a comeback.