I had to live with a husband (and his dad) who did this to our boys. It wasn’t as funny as it looks. However, if I didn’t join in, the kids figured that it was just a scam, eventually.
I used the same tactics with my piano teacher when she was bawling me out for not practicing (her opinion only, as I practiced all the time, and just got nervous with her leering over my shoulder during lessons.) She was NOT a nice lady.
He obviously doesn’t need to pee badly enough to get wet. He’ll find a convenient corner that you won’t notice for a while. :P