Can anyone point me to the rules of the word game "Botticelli?"

It involves taking a word, making a pun on it, and having the next person pun on that (I think).
For example, borrowing from goodgold's thread:

Rodomontade? Isn't that a French dish on wheels? (i.e. roulade)

I've always wanted to know how to play this game, and have only heard references to it.