Wee Did It
I remember when we were kids, my older brother and cousin who shared a bedroom emptied their bladders into old two-liter soda bottles and kept them on top of their dressers like unsanitary trophies. They were in competition to see who could fill the bottles first. I doubt they would have wanted to brag about winning though.
Apparently, they weren’t the only kids collecting their pee. If you ever find yourself the victim of young boys with a surplus of pee, make sure you use baking soda followed by vinegar for a good clean-up. Using bleach to treat urine spots can create noxious gases, and the smell will linger if it’s strong enough.