User blog comment:PurplePenguin/The Grunkle Stan Mystery/@comment-76.91.71.89-20120911022807/@comment-67.54.173.224-20121021185628

Yes, I read several sites on this theory. There is writing on the top of Tompson's mom's car that reads "Zombies rule!". This could be just them being teenagers, but there are also other things that prove Robbie worthy of our suspicouns.