This is what happens when you collide with your friend's forehead while playing tag at full-speed in gym, if he's about six inches shorter than you are.
Update 20.Jan 07: I asked at dinner if anyone had asked Lars who the president is but it's probably best they didn't, as he doesn't seem to know. He was, however, able to name all the Buffalo Sabres (occasionally with number and position), so we think he'll be fine. We are headed for the rinks now; the idea of not skating doesn't seem to have entered his reality. I hope his face will fit into his helmet!