Well, I'd hope they'd recognize parody when they see it. I'd be more worried if I had put up the deliberate, non-parody South Park merch on CafePress, rather then this parody, or even the copyrighted Yu-Gi-Oh! images that's been in their marketplace for over a year now. I'd hope they'd focus in on those deliberate infringements, rather then these parodies that claim fair use.