Ep 8. Woooo!

Ted and Barney convince Marshall to go out on the town with them, but Marshall is hesitant because he has to give a presentation the next day. Meanwhile, Robin must deal with an angry Halloween partygoer dressed as a hangman. As the night progresses, the three guys begin to woo girls at the bar by using the high-pitched "Woooo" chant. Eventually, they each bring a girl back to Ted's apartment, leading to a hilarious competition in order to determine who gets to keep their lady for the rest of the night. Robin and Lily also have their own adventure when they get lost while trying to find a Halloween party and end up at a second-rate costume party in a parking garage. The episode focuses on the different ways that people celebrate Halloween and the unexpected adventures that can happen with the right group of friends.