Germany-based telecom Deutsche Telekom apparently believes it can trademark the color magenta.  Weblog Inc’s "Engadget Mobile" site also uses a magenta color in its flag.  Deutsche Telekom doesn’t approve.

More here: http://www.engadget.com/2008/04/01/painting-the-town-magenta/
and the order: http://www.engadget.com/2008/03/31/deutsche-telekom-t-mobile-demands-engadget-mobile-discontinue/
PS: This ordeal isn’t a joke but happy April Fool’s day, too.