Bruce Willis has revealed the tactics he uses to keep his daughters' male friends in tow.

The Die Hard 4 star denied taking a hard line with potential boyfriends but told how he scared them to make sure that they treat his daughters correctly.

He told Entertainmentwise: "I'm not hard at all. I just tell the boys 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.'"