Marilyn Manson & Johnny Depp -- Dope Show

Sweet dreams are made of this -- Marilyn Manson and Johnny Depp ventured out in L.A. this week ... and Johnny didn't even TRY to hide his glass marijuana pipe.

Fun fact: Manson and Depp are good pals ... Depp invited Manson to the premiere of "Pirates of the Caribbean: Dead Man's Chest" ... they've even performed together in the past (Depp on guitar) ... and recorded a cover of "You're So Vain."

Too bad. We would have suggested ... "High Hopes."