They never had 'Don't Shit In The Pool' on the poster, and several pupils did do just that, cancelling our lesson more than once, so maybe current versions DO feature it, complete with a strained-face cartoon guy. I remember seeing one of these special items, lying at the bottom, with a brown cloud around it like some expiring submarine. And we knew who'd done it, and it was a girl
. Scandal. Imagine how much water they had to get empty just to get to it. Unless they had the best free-diving pearl-fisher in Rotherham handy, who could swim down and scoop it up in his special poop-net, and nothing more was said about it - just bung in a crate of Domestos.