[flashback to Ted with Victoria at her bakery:]
Ted: Well, this is great. You know what else is getting clean along with this cupcake tray? My conscience.
Victoria: You got anything else you need to atone for? My oven needs cleaning.
Ted: Un, no, nothing else. Not yet anyway.
[present, the gang at a restaurant:]
All: [singing] Bang, bang, bangity-bang, said a bang-bang-bangity.
[flashback:]
Victoria: I'm getting married.
[present:]
Robin: Bang.