a: lots of events compete for that. when i was 12 i stupidly went for a climb in the mountains on my own, fell from a 7-meter rock, and broke almost every bone in my body. last year i fell off the loft where my bed is and smashed three vertebrae. heights don't scare me physiologically, but i'm developing a certain suspicion.
q: name one situation you see often (on the street, at work, at school etc) that makes you very uncomfortable.