Good lord, she didn't think she would go to jail for wetting her pants! It was done in good humour, with smiling faces. There was no fear. It was just easier to make her think it wasn't our decision. Whenever something is our decision, she'll argue black and blue about it. If it's a rule set by an external authority, she'll take it on board much better. We've only ever used the 'fake law' trick that once, and it was because she needed to potty train to start daycare. She's a very well loved little girl and we're very easy going parents.