Props to infinitehotel who not only reminds us that it's CHEESE WEASEL DAY, but also provides the lyrics to the song.
HAPPY CHEESE WEASEL DAY!!!
I first heard of Cheese Weasel Day from dglenn back in 1992 - he writes about how he found out about it here, complete with links to the original emails. I believe dglenn to be the original vector for The Cheese Weasel's appearance on the Internets.