You had to be there in the 1960s to get it.
https://www.youtube.com/watch?v=1jgE-lrfZ3k
I remember walking home in Isla Vista, Cal (the off-campus area of UCSB) and hearing the Batman theme coming from dozens of houses/apartments. Yes, you really did have to be there to really get it.
“You had to be there in the 1960s to get it.”
—
I was around in the 60s and I didn’t get it.
.
https://www.youtube.com/watch?v=sBe3QzVW5_8
and of course one had to