I fvcking HATE those things!!! I can't begin to express my absolute hatred of them. It may sound like a strong reaction, but I have always seemed to have a pretty good "adrenaline flow" throughout the course of my life. Things like this immediately trigger a reaction that takes at least half an hour to come down off of, during which time I am highly irritable, seriously. Having someone do this to me in person typically results in some type of minor assault before I go out to "cool off". No, they DO NOT scare me, they piss me off, badly.
Take solace in the fact that I will skip this one based on the recommendations above and would have been far too angry to track your sorry ass down and beat you mercilessly in the street with a vigor and level of rage you'll never see ever again. No, I'm not on roids either, it's always been this way. Consider yourself lucky.