On Halloween itself and then on Sunday November 1st, I'll have the opportunity to run two games of Call of Cthulhu with a Halloween theme. Thankfully, Chaosium has published a number of collections of one-shot Halloween scenarios, including
"Halloween Horror Returns!" which is my personal favorite. The scenario "Masks of Halloween" is what I'll likely run for both sessions, giving the players the ability to explore the seemingly mundane (Halloween hay rides, etc.) with lots of great Mythos madness lying just beneath the surface...
In the past, I've run one-shots from Blood Brothers, Mansions of Madness, and even a D&D campaign build around Heroes of Horror. (Thanks for derailing that so well, Mark. Thanks...)
What will you do for Halloween, this year? Any cool gaming stuff planned?