This television episode refers to:
November 6, 2003
When the friends come to rescue Ted from his family on Staten Island, he says, "I'll get it" and runs quickly to the door. Ted's cousin Stacey asks, "Who is it?" and he is told to say "It's carol singers." Then Barney, Marshall, and Robin sing "Silent Night" while Lily and Ted make amends. This scene references the film Love Actually, in the scene where Mark comes to Juliet's door to say he loves her using cue cards, following the aforementioned pattern.