"Hangover" star Mike Epps cares so much about L.A.'s sprawling garbage problem ... the comedian actually took part in a student film to help end the epidemic -- by doing a little littering of his own.
A couple HS students were filming in a parking lot outside some L.A. mall earlier this week -- and just their luck ... they ran into Mike Epps.
The two students struck while the iron was hot, asking Mike for his opinion on littering in L.A. -- and the actor responded by tossing a crumpled up piece of paper on the ground ... and saying, "Sometimes you don't want sh*t in your car."
Obviously, the guy was joking -- and he picked up his trash -- but Epps still insists, "The world is a ghetto."
Stars in Trashy
Student Video Project
5/22/2011 5:00 AM PDT BY TMZ STAFF
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