Charlie Sheen apparently always has his mind on foreplay. That must be why he planted a lingering kiss on the lips of a very surprised Jimmy Kimmel. Sheen busted onto Kimmel's show last night, to the delight of the audience, and remarked that the talk show host has "very moist" lips. The manic actor popped up as Kimmel interviewed billionaire entrepreneur Mark Cuban, who was gushing that "Charlie's a smart guy" as he responded to Kimmel's question about "what kind of ventures" he was considering launching with Sheen. "A lot of different things," said Cuban. "He doesn’t get near the credit he deserves for being a smart guy." Sheen lobbed souvenir T-shirts into the audience and zoomed away, notes the Washington Post. (More Jimmy Kimmel stories.)