Here's a bit of genius pop art currently exhibiting at the 103rd stop on the 6 line:

Heh, heh. "Die, yacht, die!"

The ad itself is clever, effectively juxtaposing two levels of reality to relate an overarching idea. The graffiti unifies and subverts the two images, at once transforming the ad into sequential art and rewriting the rules of the form.

Mind you, the dialog needs some work. I mean, would a yacht really say "Oh, Oh!" as its being laser beamed by a giant floating head? No, it would say "Yeargh!!! My AFT!"