Those who have been watching How I Met Your Mother from the start know that each Halloween, Ted ventures upstairs to the same party where he first saw the “Slutty Pumpkin” in 2001. Each year he dresses the same — as a “Hanging Chad,” which was kinda funny at the time, I guess — in hopes that he’ll come across the mystery woman who stole his heart ten years ago. It’s been a call-back used every season since the show’s inception, leading some to wonder whether or not the “Slutty Pumpkin” will turn out to be the show’s “mother.”