Warning! Don't try this at home!
Yesterday I decided to change the oil pressure sensor in my car. So I get out the plastic ramps, put them in front of the wheels and start driving up the ramps.
Going really slowly and thinking I was at the top of the ramps I let of the throttle and the car started rolling backwards slowly. So I tap the gas pedal and BANG, CRUNCH, the car is now back on level ground.
I looked up at my daughter who is standing outside the car with a look of Horror on her face, still trying to figure out what happened and how bad the damage will be.
After gaining the courage to step out of the car I inspected the carnage. When I "Tapped" the gas pedal both ramps had shot rearword wedging themselves under the door sills about half way between the front and rear wheels.
I took my floor jack and raised the car a little, to get the ramps from under the car and inspected the underside of the car for damage. Surprisingly there was no damage to the car and only one ramp broke at the top.
Now I know what you're thinking- "That guy is a dumb@ss!" But I can assure you I've been using ramps for many years without trouble. There'* two things I should have done differently.
One- let the car roll back down the ramp before trying to go up again. Two- The ramps were on my garage floor which has very smooth concrete. The ramps have only one rubber pad on the bottom to prevent slipping. Next time I'll use ramps on my driveway which has a rough surface or put some extra rubber pads on the bottom of the ramps.
So I share my story with everyone here hoping that people are entertained but also cautious enough not to make the same mistake I did.