"That's What Friends Are For"
In this song when Ernie sings, Friends don't mind if you make a little noise, and then proceeds to play the drums, I just have to say to myself, "What about landlords, though? Do THEY mind if you make a 'little' noise?" My guess is that Susan and Gordon installed soundproofing long ago.
This is exactly the kind of situation that used to happen between my sister and me when we shared a bedroom. I always laugh really hard when Bert says, "Ernie, I'm tired..." and Ernie just completely fails to take the hint; my sister and I are still like that (granted, her hints are usually quite a bit more subtle than that).
I hope nobody is getting the idea from this that Bert & Ernie sketches influenced me to annoy my sister, because I don't think that's true at all. In fact, I think the opposite is true: that I learned to be more considerate of my sister and to see her point of view more easily because of Bert & Ernie.