Cats.
They stand on fences and yowl to attract mates.
This tends to happen at night.
It's not nice if it happens near your bedroom.
So people lob stuff at them to make them stop.
I didn't say it was a good idea, but it's the only idea I've had in two weeks
(
wilesy,
Fri 20 Jun 2003, 3:00,
archived)