Neil Patrick Harris Neil Patrick Harris

Barney and Robin may have been wearing wedding clothes last season, but that doesn't mean that anyone is getting married. In the new How I Met Your Mother promo, the Barnacle is trying to pull a runaway bride groom! But that's really the least of his problems: He's still engaged to Quinn, who doesn't know that her Barnana once dated Robin. Ruh-roh!

Check out the promo for the new season, which premieres Monday, Sept. 24 on CBS: