When I was a kid in the 60s, some of the older kids prepared for Halloween a week in advance by taking eggs from the fridge and putting them aside to rot.
They became chåda' guero, rotten eggs.
These rascal boys would go around the neighborhood singing, "Trick or treat, smell my feet, give me something good to eat."
If they threw a chåda' guero on someone's front door or car, the smell of rotten eggs would stick around for a while, unless the owners gave a good soapy washing.
Some of those boys liked Halloween, not for the candy, but for the chance to throw chåda' guero around.