Planning permission Puns

So this was a few years back for me and I best give a bit of background info: I was in the beginning of a new relationship with a girl, in my late teens . We were both at the same bording school, so I had to ask permission from her parents and my parents if she'd be allowed to come visit for weekend and all that. Got all the permissions sorted out, and planned a dinner at a chinese place. My dad and step mum came along for the ride, along with my sister.

Now, my dad has a weakish bladder and went to the toilet upon entering the restaurant. Upon emptying his bladder, he announced to us "There was a penny in the toilet. Now there is Two Pee."

I groaned, my sister rolled her eyes and my step mum nearly killed him. My then girlfriend was just mortified (first time she'd met my dad).

At the end of the meal, my dad went to the toilet again. This time he came out with a 2p coin in a tissue, drying it. My then girlfriend was just looked at me as if to say "you're father is mental how are you sane."

I pointed out to my dad the flaw in his trick, stating he'd said it was a penny, not a 2p coin. I think my step mum hit him shortly after he dropped me off at my mum's...