Emoticon
In 2000 Despair, Inc. obtained a U.S. trademark registration for the "frowny" emoticon :-( when used on "greeting cards, posters and art prints." In 2001, they issued a satirical press release, announcing that they would sue Internet users who typed the frowny; the joke backfired and the company received a storm of protest when its mock release was posted at technology news website Slashdot.  They subsequently issued another press release a month later in response to the reaction their claim had generated.