[Barney goes to Marshall and Lily's apartment dressed like a farmer and playing a banjo:]
Barney: [singing] Bro McDonald had a farm, E-I-E-I-bro And on that farm he had some chicks E-I-E-I-bro With a hot chick here and a dumb chick there...

Marshall: Ooh. Our demise. [Lily wails] Barney, how would you explain to little Marvin why we're not around anymore?
Lily: No.
Barney: Easy, all I'd have to do is change a few words to one of my classics with the ladies.
[fantasy scene with Barney sitting down with a suited-up, six-year-old Marvin:]
Barney: The President of the World has called your parents away on a super-secret space mission. For the sake of the planet, you will never see them again. Now pick up your toys and say good night to Daddy.
[reality:]
Barney: What do you know? That last line stays the same.
Marshall: Judges?
Lily: [blows raspberry and gives a thumbs down]

[Barney goes to Marshall and Lily's apartment dressed like a bus driver]
Barney: [singing] The boobs on the bus go up and down Up and down, up and down The boobs on the bus go up and down [Marshall slams the door, then opens it] All through the town.