I once went to a swimming pool, where they had a notice on the wall in the changing room, warning swimmers they weren't allowed to swim within 21 days of having diarrhoea. I found myself wondering how many times people would have seen the notice, got dressed again and gone back to the cash desk for a refund, explaining "I had diarrhoea 17 days ago."
I pictured recently-dysenteric people all over the city, counting down the days until they could legally swim again: 4, 3, 2 - oops, I shouldn't have eaten that curry, now it's back to 21 again!
This post is just an excuse to show off that I can spell diarrhoea.
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