I used to go out with a gymnastic instructor..........
We went home to her place and she was doing some excercises by the bed......getting ready for some horizontal mambo......
Kicking her legs up in the air forwards and backwards, just as I happened to walk into the bedroom.

Thud!!!! omfg......
a back kick to the Knackers......
I walked right into it......
it brings tears to my eyes even to this day....thinking about it...
and we went straight to sleep after that.......