Could this be the best superhero mashup around? Or do the Puerto Ricans know something about Joss Whedon's new Avengers movie that we don't? According to Reddit, this is an Avengers t-shirt being sold on the streets of Puerto Rico. Blending the bat, the spider and the giant blue cat from Avatar makes this the very best comic book t-shirt we've ever seen. Especially because the Na'vi looks like he's sitting on his litter box. Awesome stuff.