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I knew a family that took funny photos of themselves and hid them all over the couples apartment while they were away on their honeymoon for them to find when they got home. There were also hold fish in all the sinks and tubs. I love funny stuff like this.
A sign saying this VERY thing used to hang next to the cash register at our city pool in the 70's.... I cant still remember the day I FINALLY "got" what it meant and thought it was so funny... but always felt a little guilty cause it always felt so good to pee in the pool. (C'mon, you know its true)