Carolers and Dr. Doofenshmirtz in “Unfinished Business”

[singing to We Wish You a Merry Christmas] We won't go until we get some, we won't go until we get some, so bring some right here!

Dr. Doofenshmirtz

Wha-what...are-are you threatening me? How dare you! No one barges into my home and demands desserts! What sort of plan is that anyway, "Let's go to a stranger's house and in song form, refuse to leave unless he hands over a food dish no one's prepared since the 16th century?!"