Houseguests are like fish. After seven days they both stink.

~ Grouch Marx

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I think if you don't want guests to stay around too long you should build a guest house out of fish. Do that and guests will leave about the time you want them to. I think this is why some of the students at Iowa State hid an open can of tuna in Joe's office. I think this is also why Joe doesn't work at Iowa State anymore.