Revenge piss for your ex! How does he explain THAT to his new girlfriend?!

I was at my ex’s to pick up my last things. He made me so angry again that at some point I had the idea of taking revenge on him. So I disappeared into the bathroom under an excuse and just let my anger, or rather my bladder, run wild. It’s a good thing I didn’t go to the toilet that day, so I was able to get rid of my lovely, intense morning urine there. After that I just left. I’m already looking forward to the reaction of him and his new wife. Which of the two discovered the puddle first? I think that would be a real hassle, but it was worth it to me. How would you have reacted in the situation?