If you've lived in San Antonio for any amount of time, I'm sure you've noticed that some citizens like to decorate the back windows of their pick-up trucks with custom decals. Sometimes these decals are names, sometimes they're representations of families (even if truncated a bit), and sometimes they are pictures. Often the pictures are of the faces of whoever is hot with the Spurs at the time, but every once in a while the face is just a tad unusual.
Like this one:
Spider-head. Nobody knows who you are.