Usually people are jerks about this sort of thing, but so far most of the comments we've seen online have been positive!
If you want to know more about PETA's Tube Ad Takeover, click here.
Oh, and remember when an ad agency did this same thing, but with pictures of cats? That was awesome.
Since their rescue last week from under the electrified third rail of an above-ground express track in Brooklyn, the gray-striped and black kitties have found themselves the stars of Steven Liu's website, Scratching Pad.