Tainted sweets
The third tier chocolate bar, that little Timmy recieved was like no other he had ever eaten. Little did the kid know, it was in fact a collection of alien eggs, carefully secreated between nougat, caramel and chocolate, and wrapped in a plastic packet that could withstand re-entry but not a simple tearing motion. Tastes a little funky, but you don’t get that choosy in this economy. Well, the eggs are small enough to not get crunched. They gestate quickly. By Christmas you are a zombie slave. Your appearance changes drastically from a young boy to an adult. Only a careful look will show, through the blank expression that the engine is running, but the driver’s just too small to see.
The adult finds a place to live, and a job, normally in fast food or law enforcement. He is then ready for the mating in april. The fertilized eggs, secreated in the familiar egg pods that so resembles a mars bar, are then placed in bowls and then handed to the next year’s trick or treaters.
Perhaps it would have been better for the future of our race, that they just choose to trick.... Getting TP’d does not upset the alien infested hosts, but it could save lives down the road.
Nobody knows that this is happening. No one excepts for chocolate manufacturers , who serve a different alien species and these are bent on killing us with onset diabetes...