Way back when I was 20 years old I got laid off from the machine shop where I worked. Me and about 250 other folks...half the shop. This was around 1983.
Anyhow, my buddy and I started tinting car windows. We told the customer how much of what kind of tint to buy and where. Bring it to us with a case of Old Milwaukee tall boys and we'd tint their car. One step above Milwaukee's Best. I think, lol.