Sorry, old chap; I had too much bubble and squeak.
Weird question this one, but I was just outside late at night and hear an animal make a sound about 20 meters away that I'd never heard before.
Sounded a bit like someone going 'ptssshh' through their teeth or something, but at a much higher frequency. I live in England, in the countryside.
Just intrigued, would be interesting if anyone can tell me!