Quote from Barney in Slapsgiving
Barney: No, no. The countdown ends at 3:00 p.m., the day after Thanksgiving. I counted it out. Ted: How many days are in October? Barney: Uh, thirty. Ted: Dude, I thought we cleared this up last year. [flashback to Barney dressed as Borat in MacLaren's:] Barney: I like Halloween very much. Is nice. Ted: Is also tomorrow. Barney: Damn it!