Butterfly mode actually included with Emacs v23…
Wednesday, September 23rd, 2009
Fortunately the command has been shorted to M-x butterfly.

Fortunately the command has been shorted to M-x butterfly.
Obviously I have to post this.
Knuth’s Tex for the Math-kings of sigma, and pi,
Unix vim for the Server-lords with their O’Reilly tomes,
Word for Mortal Men doomed to die,
Emacs from the Bearded One on his Gnu throne,
In the land of Stallman where free software lies.
One Emacs to rule them all. One Emacs to find them,
One Emacs to take commands and to the keystrokes bind them,
In the land of Stallman, where free software lies.– Raffael Cavallaro, gnu.emacs.help
In a similar literary vein: Emacs Haiku. To laugh with these is to weep for what you have become.
Discovered this in WebPurify‘s FAQ while reviewing profanity filters for Tikatok.
Q. How do you handle words that may or may not be profane, depending on the usage? (i.e Vice President Dick Cheney)
A. We are currently developing a method that will enable you to choose if you want WebPurify to eliminate such words. It currently does not.
Need. This. Feature.