Bruce Willis threatens to kill boys who date his daughters.The 'Die Hard' star has three daughters with ex-wife Demi Moore - Rumer, 18, Scout, 15, and Tallulah, 13 - and is extremely strict with their boyfriends and suitors.Bruce told People magazine: "I'm not hard at all. I just tell them I want to meet them - that's the only thing I ask for. I just give them that look, that little look."I always put one of them in charge. If they bring a little group of guys over to the house to have a pool party or whatever, I just say, 'Dude, what's your name?' and he says, 'Uh,Cinjun.' I say, 'Cinjun, you're in charge. If anything happens to one of my daughters I'm coming to you first, and then I'm going to kill all your friends right in front of you, and you'll be last.'"My relationship with my daughters is a lot more upfront than that, and what we've done, as parents, is to try and send the girls out in the world with as much information about what those 16 and 18-year-old boys are thinking, and hopefully that'll keep them safe."