I honestly think he just lost his balance.

( Master Of Turnips. Only gays and morons believe in ghosts., Mon 18 May 2009, 15:13, archived)

His defence was
'I was trying to head the ball, which I believe is a legal move in football'.
(rnuk http://flickr.com/rnuk, Mon 18 May 2009, 15:16, archived)