Thanks to everyone who has contributed to making this thread the best read I've had in ages.

I have to share one sublime experience of a Mondegreen with you. My husband and I were eating an indifferent (and unidentifiable) meal in a downmarket restaurant in Varna, Bulgaria, to the accompaniment of a live band. Although the band was performing covers of well-known songs (Beatles and such like), it was obvious that none of them actually understood a word of what they were singing, and hence the performance was littered with Mondegreens. The best one, though, occured in 'Take Me Home Country Roads' when instead of extolling the virtues of 'West Virginia', they were singing the praises of 'Wet Vagina'.

F. x