I would certainly pi$$ on the floor. I did it in Elementary school when the teacher told me no. Small people have small bladders, and good hydration is crucial for good health.
I was working a flight to Tokyo when a kid jumped up right after takeoff and went running down the aisle towards the lav. The lady that was working that aisle yelled at the kid to get back in her seat, so she squatted and peed right on the galley floor. My co-worker said to me, “That’s the last time I do that!”