Haven't overfilled mine yet, but it's on my list
My neighbor's wife came over one day all flustered. She was dumping water out of the pool after a big rain. Let out too much, started running water to refill. Forget about it, overfilled it. Started dumping again, dumped too much. That's when she came over almost in tears. "please don't tell my husband" she asked. I said no problem, at least not for a while
True story and we still laugh with her about that.