I don’t think that even the parody defense will save the “420 Football League,” whose goal, as it were, is that players take a bong hit, hold it as long as possible, time themselves, and advance the ball [?] one yard for every second the hit is held.

Much as I enjoy criticizing frivolous trademark claims, I have to admit that this one pretty much hits the dilution by tarnishment nail squarely on the head.  Thanks to TMZ for the tip.  See?  There is value in reading gossip sites!