well i bend over to pick up peice of trash on bathroom floor at work and i like pull my head up VERY FAST for no reazon was in rush to get out probly but i slam my head into the haind air dtyers funnel thing.. fuckin nocked me right down to the ground omg hurt so bad.. next day huge bump .. major hedace .. ..later today i hit my head 2x gettin out of cars in same spot then i was opening a door and hit me in the FUCKIN FACE man.. im afraid!