Quoting this BoingBoing story:
Brad Templeton — the long-time moderator of rec.humor.funny and host of the rhf archives — has received a cease-and-desist notice from AmEx’s lawyers over a 13 year old joke called “American Expressway.” Brad, being fully aware of the Constitutionally protected right to parody and how that trumps trademark, has posted a link to the joke, the C&D, and his response, which pokes vicious fun at AmEx’s lawyers at the firm of Dewey, Cheatham and Howe.
Read Brad’s hilarious replies here. There’s also a good bit of fun comments on SlashDot.