"Boys and girls may hug and kiss, But they should never go like this. Shift-unshift-shift-unshift-shift-unshift" One would have to know mechanical RTTY machines to get this!
It's an oldie for sure! I heard it (and sent it) back in the 70s and I learned it from an oldtimer then.
He gave me gigs of English language videos used to teach electronics to students in the third world. One of my favorite instructors. lol now I know where he got that phrase..