that contains a much less funny version of this -- which I read a long, long time ago:The Thunder God went for a rideUpon his favorite filly.I am THOR! he cried.The horse replied,You forgot your thaddle, thilly!There is a much more raunchy variation of the same wordplay available; look up +tho thor +pith at Altavista, which is not working for me right now, or I would have given you a url.As for