WINNER, post of the thread. This is what I was thinking the exact same thing, but didn't know how to articulate it properly.
Homer Simpson: That’s all well and good for you, but I used to rock and roll all night and party every day. Then it was every other day... now I’m lucky to find half an hour a week in which to get funky. I’ve got to get out of this rut and back into the groove.
[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...