Apple is famous for protecting its intellectual property (IP) and has gone so far as to sue folks for things that have absolutely nothing to do with iPods, iPhones, or even music. Since Apple has been awarded a trademark on the "There's an app for that" slogan, we hope they don't decide to take a club to the kid's show, Sesame Street.
Sesame Street produced a segment around the iPogo Stick (which is already enough, most likely, to attract Apple's ire). However, in the segment Sesame Street did, the term "There's an app for that" was tossed around quite a bit.
We'll see if anything legal comes of this. Hopefully, it will just be ignored. In the meanwhile, here's the segment.