Ha! That reminds me of one my friend Jim left on his machine right after he got his cat... we had a blizzard coming our way, so everybody was running out for milk, eggs, etc:

"Hi you've reached Jim. I can't come to the phone right now because I'm getting ready for the snow. Lets see, I've got eggs, milk, bread, butter - oh S*#@ - I forgot cat food!"

I don't know why that tickled my funny bone, but I must have called and hung up ten times just to hear the message!