Marlon Wayans -- Charlie Sheen and Lindsay Lohan Are 'A Crack Explosion'

Charlie Sheen and Lindsay Lohan are going to be in the new "Scary Movie" film ... and the guy who helped create the series says their scene together is going to be "a crack explosion."

Marlon Wayans, who co-wrote and starred in the first two "Scary" films, trashed the two most recent sequels last night ... which he did not have anything to do with. He said he would only watch the new one as part of a "bad movie night."