People are expected to be generous on Halloween.
Thelma likes to see the kids' costumes on Halloweeen and is giving out candy, so they'll visit.
Thelma wants to keep some of the Halloween candy.
Thelma buys an extra bag of candy, so she has enough for the kids and herself.
Thelma only allows each kid to have one tiny piece of candy.
The kids love her candy and visit her again next year.
Thelma gets a reputation for stinginess, and the kids don't visit her next Halloween.