Kids go trick-or-treating on Halloween for one main reason- the candy.
They head out in packs hoping to fill their pails and sacks with enough sweet treats to tide them over until the New Year, but some people don't want to part with their candy.
These townies require a bit of coaxing to give up their candy or, as this comic from Nedroid comics shows, a simple trick known as burglary...
-Via Geeks Are Sexy