Currently there are no licenses or background checks required for puns of that size. Once our lawmakers finish voting themselves more benefits, raises and raising the cap on extra $$$ they can bring in, I'm sure that they will turn to limiting the size of a pun without a license.
Since I'm sharing... I've hit a personal milestone. The front of the fridge is full. Now am working on the sides. FYI, it started out as a joke, but now it's not that funny any more. And I'm no where near the world record according to my good friend Wikipedia.