On the subject of the pimple on the scrotum and the reflection of the knee...
My wife (at the time) accidentally bitten my scrotum to blood during the type of games and kind of affection. The reflex was double – first with the hand in the forehead (chess the word reflexively) well, and the second in the back with the foot... because from the hand hit she did not squeeze her teeth and led her back. The egg behind her. The leg behind the egg. It was very painful (