Dieter Laser is pretty much my new favorite actor.
By all accounts, I should have been shocked and disgusted. I found myself laughing most of the time. I couldn't figure out why for most of the movie, but I figured it out at the end. It's Always Sunny in Philadelphia dedicated an episode to making this point: poop is funny. Even when it's passing from a guy to the girl behind him with a crazy German scientist yelling "Feeeed her! Feed her!". It's still funny.
Still, this movie was fucked up.