So, I was at Starbucks this morning, feeling inhuman before my coffee, and I suddenly had an irrational urge to kick the guy standing in front of me in the back of the knee. But then I thought that that would probly cause more problems than it was worth and decided not to. People who stand with one leg bent and the other knee locked need to be aware, that if someone is behind you, and pushes / kicks the locked knee from the back - you are going down (don't believe me? Find a soft place to fall and do it to someone).