I’d be willing to bet your parents either used to check your Halloween candy or really nagged you to use your head before you enjoyed it. I know my parents did.
Don’t eat anything that looks opened. Don’t eat anything homemade. Check the wrappers. Make sure nobody put anything weird in your candy.
It was one of those things adults told kids without explaining why. I always thought it was some urban legend… Like, come on, who is putting razor blades in the caramel apples? And then I ran across a true story of Halloween murder…