When I was thirteen I used a suicide jack and put my legs under the vehicle that had no wheels on it. The jack came crashing down and it was a good thing my legs were in a dip in the mud because it was a e-350 van so it would've crushed them. It fell in less than a second.
Definitely use a good jackstand because it will fall way faster than you can get out from under it.
2009 Ford Escape Limited - 3.0L, 6 speed auto, 4x4, 25/33 city/hwy imp mpg.
2014 Chevy Cruze Diesel - Korean designed, American made, with an engine designed in Italy, built by Germans and mated to a Japanese transmission. 42/67 city/hwy imp mpg