Because General Mills only sells "Monster Cereals" like Count Chocula and Franken Berry during Halloween, people are actually hoarding the stuff.

Fans of the sugar bomb breakfast cereals are buying boxes in bulk and storing them so they can keep enjoying it after Halloween ends. And in case you were interested in picking up some monster cereals for yourself, you'll get to choose from five varieties: Boo Berry, Count Chocula, Franken Berry, Frute Brute, and Fruity Yummy Mummy.

People hoarding monster cereals because they’re only available during Halloween. What do you buy in bulk? - Tweet

Here's a classic Count Chocula commercial... Enjoy! :)