In a 1985 interview with Spin magazine, ZZ Top bass player Dusty Hill explained the inspiration for this song: "We have a good friend who's a mechanic, and he's just wild. A long time ago, I had this old Triumph car, and it kept messing up real bad, and I asked him over to the house. We had a few beers, and I said, 'Why don't you take a look at my car.' He reached up under my dashboard, and he ripped out a handful of wires and he said, 'First of all, you don't need this.' I don't know anything about cars, but I figured they wouldn't be in there if they weren't necessary. I said, 'God, man!' But he fixed it. He was the manic mechanic. A lot of mechanics get a little manic behind it. People get manic dealing with mechanics, too."