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Pins, needles, and razor blades being hidden in candy during Halloween is a common source of fear. While there is a spotted history of these malicious 'tricks' being carried out - poisoned candy really only has one well known (and fatal) incident.
> In a 1974 case, Timothy O'Bryan, an 8-year-old boy from Deer Park, Texas, died after eating a cyanide-laced package of Pixy Stix. A subsequent police investigation eventually determined that the poisoned candy had been planted in his trick-or-treat pile by the boy's father, Ronald Clark O'Bryan, who also gave out poisoned candy to other children in an attempt to cover up the murder. The murderer, who had wanted to claim life insurance money, was executed in 1984.
There's also a documentary about the history of some popular urban legends that's available on Amazon that's worth watching if this topic interests you. Killer Legends
On another note, I really love how games incorporate the time of year into the actual design and gaming experience. I used to play Farmville (for example) and I know they used to roll out a lot of specialty items for Halloween. Right now in terms of mobile based games, I'm really enjoying PokemonGo and [Nibblers]https://play.google.com/store/apps/details?id=com.rovio.Nibblers&hl=en).
Also I want to say a big "Thank You!" to /u/TempestTcup for bringing some Halloween spirit to the sub! :0)