Season 5: Episode 16 - Hooked

Hooked: As a result of Ted being "hooked" on Tiffany, the gang reflects about relationships where one person is “hooked”;  being strung along by another who wants something more. Scooter, the "lunch lady" at Lily's school is hooked on her, and she and Marshall practice letting him off the hook and both have trouble hurting his feelings. Tiffany humiliates Ted by showing up with her boyfriend at a weekend wedding get-away, and neglecting to dis-invited Ted, who has set up a romantic dinner for them in their room. This is a real eye-opener for Ted, and ultimately lets him off the hook.