For example: Richie being "spooked" by Bag and the Demons at a haunted house party on Happy Days.

Or, there's "two-headed" Michael Scott on The Office. Perhaps the Diwali episode even counts. (Remember how Michael's then-girlfriend dressed as a cheerleader?)

Of course, The Simpsons has formed a cottage industry out of their "Treehouse of Horror" annuals. Does one entry stick out for you?

Any other memorable Halloween-themed episodes of your favorite TV series come to mind? Share them here!