Not as fun as when I offered to help my friend Hamid sue his employers for violating the Open Gaming License. Hamid wrote a card for the commercial break of Inuyasha, giving the stats of Tetsaiga (though he made the mistake that the falchion form is sized for a large creature, and that Inuyasha's demon blood lets him wield it even though he's only medium).
Hamid, though, apparently wanted to keep his job, and so we decided against bringing legal action forward. I do think, though, that it'd be hilarious if one time they just presented full d20 stats for a character on one of the shows, and then filled the screen with the d20 license. I'll have to propose that idea.