Charlie Sheen reveals he put an ice cube up his butt to stay awake on set during his crack addiction"I was filming a movie in Canada called Free Money, and I'd been going way too hard. I was trying to get through it and I thought I was keeping it together""The director, between takes, walks up and he says, 'Hey, man. I see you falling asleep on camera'""And so I said, 'Okay, oh shit. All right. My bad. I need a cup of ice. Bring me a cup of ice'""So I go into the bathroom. I heard about this som