A large mirror.
For reasons that are not important at this juncture, I stuck a large mirror down on the floor for 20 minutes, so I could move stuff around. I come back for it? And it's swimming with a little lake.
The best? Part is that the paper backing of the mirror got wet, thus meaning I can either throw it out or figure out how to de pee a large mirror.
It's bigger than the damn dog.