The big twist of the other summer camp Goosebumps was that the camp was run by a giant purple blob that sweat snails and smelled so bad he had an army of abducted children hose him down 24/7, and they killed him by not washing him until his own BO killed him.
Wasn't there *another* summer camp one where an alien hides out in a kid's cabin, but it turns out that the kid was actually an earthling and the campers were all aliens but had another face in the back of their head that didn't get mentioned till the very last three seconds of the show?
Hell, R.L. Stine probably just had a mad-lip template for these in his word processor.