Be careful, Don't let this happen to you

For the life of me, I cannot understand why anyone would attempt to go under a vehicle that was jacked up without properly blocking the wheels and adding substantial jackstands or wooden blocks. As a child of the 70's, I remember reports of so many people getting crushed under vehicles because their bumper jack dropped the car when it rolled forward/backward. First thing I bought when I started driving was a pair of wheel ramps so I could change my own oil....I also made sure that the wheels were blocked and the parking brake was applied. Safety first!!