They were able to swoop down and grab a piece at a time with their little clawed feet. With so many of them, they were able to empty the pumpkin bowl in no time! Skeleton is a bonehead and just thought they were after insects.

Motivation? Robin was over at Bruce Wayne's mansion, and begging to go out trick-or-treating. Batman told him he looked ridiculous, and reminded Robin his "costume" was for WORK ONLY.

So, Robin called in the bat brigade and offered them a bag of mealworms for every ten pieces of candy they brought him. The Jack-o-Lanterns saw it all but sat and laughed evilly.