Did it once.
Luckily I had only gotten the car backed out of the bay before I realized I was leaving an oil streak on the floor. Back on the lift it went.
Some things you learn from.
When I worked at one of the local Ford dealerships one of my fellow techs and I were talking about these kind of mistakes and placing bets on when the rookie, doing his internship from a local tech school would forget the drain plug. It happened the next day. We've all been there at least once and the list of bone head mistakes goes on and on. Once you do something like that you'll never do it again.
Like leaving the rotor button off and wondering why the car won't fire. Get back under the hood and see both rotors buttons laying on the inner fender.