You have been marketing a product called "Radiant Farms Canned Unicorn Meat" using the slogan "Unicorn – the new white meat." … National Pork Board is the owner of THE OTHER WHITE MEAT® in the United States and elsewhere around the world, and owns the following federal trademark registrations.
Excellent source of sparkles.
The legal rationale in these situations is often that you can't let someone so much as whisper your trademark in vain lest it be genericized or otherwise diluted; thereby implying that the threat is empty, and just to demonstrate active defense of the mark should a 'real' case ever arise. But I'm sure someone got paid for writing that 12-page letter.