Elphaba

In a typically deep, philosophical conversation with a friend, he emailed me this:

"Slugs are without a doubt one of the big mistakes of Intelligent Design, or
whatever. It seems that the original amount called for in the recipe was
given an extra zero, and in consequence we wound up with all these homeless
snails.

Tough on slugs, tough on the causes of slugs, say I. And it *is* good fun to
dump a bit of salt on the buggers and watch 'em squirm.

Have you tried the beer solution? If not, place a large saucer half full of
beer in your garden. Slugs, like Canadians, go crazy for it. The next morning
you will find a saucerful of slugs and, if you're really unlucky, some of them
will still be drunkenly singing 'O Canada'."

My question is "who taught the slugs the words to 'O Canada'?"