In various websites on the Internet, including http://www.joke-archives.com/dictionaries/dictionarywords.html, I've come across the phrase Arachnoleptic fit.
Apparently all the words in that set (Beelzebug, Bozone, etc.) are all made by either adding, removing, or replacing a letter from an already existing word or phrase. But I can't figure out the original phrase for Arachnoleptic fit which only changes one letter of the word.
I've tried Googling, and got lots of pages mentioning the word, but none explaining its origin.