Hey, if it makes you feel any better, I was teaching a friend of mine how to change the oil in her MINI a couple of months ago. Her car is lowered to the point that we had to slide the scissor jack under to jack it up a few inches, then put a regular floor jack under it and jack it up, then set it down on the driveway ramps.
Anyhow, after we were done, we had to jack the car up off the ramps, pull the ramps, then slowly drop the car down again. Just as we got the car low enough to think about switching from the floor jack to the scissor jack, the car fell off the floor jack & the floor jack ended up embedded 3 inches into her John Cooper Works (MINI's answer to Mazdaspeed/TRD/Nismo, etc.) side skirt on the driver's side. Shattered that sucker.
Why? Because her garage is tiled and there are 12" carpet patches glued down where the wheels of the car go when she parks. (Don't ask me why) And the jack was sitting partially on the carpet, which kept it from slowly inching out from under the car as the car lowered, the way it should. The lateral pressure built & eventually the jack point snapped (plastic jack point held to frame rail with a small bolt) and the car dropped. Came within about 1/8" of crushing the bottom of the driver's door.
I'm just glad nobody was under the darned car.