Yup, worked a Shell station as a pump jockey during HS. We would use wheel weights to jam the lift lever in the down position after we mopped the floors before closing to bring the lift down (they were slow when unloaded). One time I forgot to remove one wheel weight, and when the compressor was fired up in the morning, up went the lift. No one was watching, and a very-very old vintage car went up into the air and bent the roll up door, and broke some windows.
Whooooops. I got a lecture for that fubar and it was painful since it was the owners ride.
Sowwwwy!!!