Katherine Heigl's mum kept the actress in line when she was growing up by threatening to send her off to a convent if she missed her curfew.
The Knocked Up star's mother Nancy insisted her daughter was always home by 1am in a bid to keep the blonde beauty out of trouble, and the actress always adhered to the rule - because she feared she'd be enrolled in a Swiss nunnery if she didn't make it home on time.
In a family interview with Elle magazine, Nancy explains, "Katie believed it for a very, very long time, and that's the most important thing. I believed I would do it, and she believed I would do it... We go to Switzerland. We go to the bottom of the mountain. We take away all her clothes, we put her in a cloth sack, we put her on a donkey and send her up to the top of the mountain, where she doesn't get to talk to anybody on a regular basis but will occasionally get a letter from me saying, 'How you doing?'"
But the star confesses she finally got fed up with her mum's rules and moved out at 22 after realising all her pals weren't tied down by the same restraints.
The actresses adds, "I had this boyfriend, and we were really serious. I'd be over at this house and it would come around one, and I'd be like, 'I gotta go. I got this curfew.' One night, he just looked at me and was like, 'What the hell is wrong with you?'"