Did People Tint Windows in mid - late 70s?

As a side note, if I pulled the curtain behind the front seats, I could park it anywhere and have a 'good time' with my girlfriend and nobody was the wiser. Maybe that is why all my friends wanted to borrow it on Friday and Saturday nights. Got to drive a bunch of cool cars those nights.

Those were the days.

That's where the bumper sticker came from : If this van's a rockin, don't come knockin!