“No one can be so welcome a guest that he will not annoy his host after three days.” — Plautus
(My mom always used to say: House guests and fish, both stink after three days! Try not to stink, folks. Be well and do good, friends.) — YUR
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Unclerave's Wordy Weblog 
Your mom used the Ben Franklin version, and Ben could always say it better … but think how bad three-day-old fish must have smelled back in Plautus’s time!