A while back, LucasFilm sent a cease-and-desist letter to the makers of the crazy-powerful Spyder III Arctic laser because they felt that it resembled lightsabres too much. They have retracted that letter in an amusing way.
Basically LucasFilm's lawyers sent another letter explaining that they'll retract the cease-and-desist as long as the laser products are clearly labelled with a disclaimer that there is no association between Pro Arctic and LucasFilm. The part that makes me chuckle is that this decision was apparently made because "the media and public has come to realise that Lucasfilm would never endorse or licence a highly dangerous product such as your Arctic Pro Laser." [HotHardware via SlashGear]