I've been lurking for a few years, but had to finally create an account!
So for Legacy's most recent Bob's Burger's clue..
I think it points to Return to Oz. Jack Pumpkinhead is a character with a pumpkin for a head, and he calls Dorothy his mom. Like in his clue, a dad is a parental unit and so is a mom. Legacy also said there was a reason he thought it was the movie Pumpkinhead...