This peculiar illness strikes those who, after seeing The Craft or the like, think "Wow! Magick is cool!" and immediately drag out the chalice and candles and knife-they-use-as-an-athame and expect to be able to fly and summon Lucifer. This condition usually lasts until someone whacks them upside the head with a cluebat or until they actually manage to do some magick, which usually makes them run home to mommy.

Oddly enough, IWS is very close to, and sometimes a precursor of, MegaPagan Syndrome.