Because this is the world we live in, Norwegian underwear manufacturer Comfyballs was denied a US trademark for their product (obtaining a European trademark was no problem because they're not so prudish over there) because, "The mark does not create a double entendre or other idiomatic expression... When used in this way, the word 'balls' has an offensive meaning." Seriously? What is the offensive meaning? That you're referencing nuts? How is that offensive? And, more importantly, does this mean they're going to deny my trademark for DongArmor?
Thanks to TonyPepparoni, whose name has been denied trademarks on several occasions, and not just in the US.