[s1e6] Slutty Pumpkin -

She wrote her phone number on a Kit Kat bar wrapper , which Lily accidentally gave away to a trick-or-treater later that night.

In 2001, Ted (dressed as a Hanging Chad) met a girl in a "Slutty Pumpkin" costume. They hit it off over her specialty drink—a mix of Kahlua and Root Beer she called a " Tootsie Roll "—and her knowledge of penguins. [S1E6] Slutty Pumpkin

Ted eventually finds the Slutty Pumpkin (played by Katie Holmes) in Season 7, Episode 8, titled "The Slutty Pumpkin Returns" . She wrote her phone number on a Kit