That's so funny!
Miko has done that too! Once, he followed me into the bathroom and he scratched at the walk-in shower door, so I opened it and he ran in circles in there jumping and pushing his front paws against the walls and then he peed right over the drain...I couldn't belive what I was seeing, and then he ran laps through the entire house. It was a riot. Haha. It's good to see that Miko isn't the only one who has peed in the shower!