A club popular with 18-year olds in my city had the most effective piss-room I’ve ever seen. Troughs on three full walls and they were always busy. You’d wait for 1 second and then get a spot where you could squeeze in, shoulder to shoulder with other guys. You’d feel the steam rising up and washing past your face. 10 seconds later, you stepped out and another guy would instantly take your place.

It was incredible. I’ve never seen such efficiency anywhere else.