I think the work of Eva and Royal and company may be a completely new subgenre: camp with extremely dark overtones.  Dark camp.  Like dark comedy, sort of.  Not in the sense of camp horror, which has been done plenty in movies like Dawn of the Dead; more a darkness of taste and psychology.  In The Sheriff Was a Robot, Eva disarms you with humor and then takes it one carefully calculated step too far.

But even this step doesn't take the form of a departure: the tone remains consistent throughout, leaving you to wonder if you're the only one shocked and appalled.  Truly diabolical.

It's hard for me to say exactly why I find the ending so disturbing, with the baby (I won't spoil it in case you haven't seen the movie yet), but the creepiness of this ten dollar special-effect is beyond anything that Steven Spielberg can even approach, with all of his big-budget resources, in A.I..