Homer: Grand Funk Railroad paved the way for Jefferson airplane, which cleared the way for Jefferson starship. The stage was now set for the Alan Parsons project, which I believe was some sort of hovercraft.
[the teenagers Homer and Barney are doing an acapella version of “You Make Me Feel Like Dancing” in front of a mirror]
Middle-aged Grampa: What the Hell are you two doin’?
Young Barney: It’s called rockin’ out!
Young Homer: You wouldn’t understan’, dad. You’re not *with it*.
Middle-aged Grampa: I used to be with it, but then they changed what *it* was. Now what I’m with isn’t *it*, and what’s *it* seems weird and scary to me. It’ll happen to you...