I took my sister up for her first ever flight in a smal aircraft and afterward when we'd parked and shut the aircraft down, she got out and walked round the front to my side.
BOOIINNNGGGG !! Straight in to the (fortunately stationary) prop! Big red mark on the forehead!
Another time, I was shuffling around under the wing, (its a very low wing), checking the flaps when I turned and head-butted the open end of the pitot tube. I ended up with a perfect red circle in the centre of my forehead.
You'll no doubt be pleased to know that there was no damage to the pitot head.