I remember seeing a Pie RP once. One of mai friends started it and I joined in. xD Not really an RP, though.
I also remember seeing a Poptart RP? I dunno there was like, Cinnamon Poptart, Blueberry Poptart, Strawberry Popart, etc.
There's one other that I'm not going to mention, though. It was ... >.> Very, very, very, strange. Memory scares me more than Slenderman coming into mai room while I'm typing this.