Ted and Stella get engaged, but Ted soon learns that he doesn't know anything about her. Meanwhile, Barney confesses to Lily that he's in love with Robin.
| Title | Do I Know You? |
|---|---|
| Genres | Comedy |
| Release Date | 2008-09-22 |
| Episode Runtime | 00 Hours 22 Minutes |
| Season Number | 4 |
| Episode Number | 1 |
| Production Companies | Carter Bays, 20th Century Fox Television |
