Third Wheel
How I Met Your Mother Season 3 Episode 3 (10/08/07)
Recap
Ted bumps into Trudy (the girl he met in The Pineapple Incident). He goes on another date with her and her sorority sister, Rachel, shows up on their date and is very interested in Ted. Ted tries to orchestrate a threesome (a tricycle as they call it), but never reveals if it happened or not.