My in-laws have a leak in their bathroom apparently.
My wife goes up to her parents house close to once a week with the kids for a change of pace, and when they went up yesterday the bathroom sink's faucet was dripping. When they got there my Son went in the bathroom to wash his hands, but when he came out grandpa got mad at him for because he didn't move "the bowl" before he washed his hands.
Grandpa put a bowl under the sink. To catch the drips. These are the drips that are dripping from the bathroom faucet, that would be dripping into the basin if they weren't caught by the bowl. Grandpa is pretty OCD at times but keeping water out of the sink is pretty excessive, even for him.
He did tell my wife later that he doesn't want the sink to get stained so that's why he put the bowl there. But don't be dirtying up his bowl with your handwashing filth! Maybe I should some bowl liners as a present for the in-laws?