I have a "hair trigger" response also but nothing on the level of these.

However, if you sneak up behind me and touch me in anyway from behind when I don't know you are there----well your ass is on the ground and you definately have some kind of facial injury.

Almost flattened a doctor at work once. He came up behind me, lightly tugged on my hair to get my attention----well he got it. Thank god I stopped in time or he would have certainly have been on the floor. OOPS!