That's crazy you said that, Back in the late 70's I had a 70 340 cuda with a slap stick shifter round knob with button on top. I was getting on the xway full throttle low gear and hit the lever apparently hitting the button and put it right in reverse at full throttle at 6000 rpm. The 340 never slowed down just started smoking the tires in reverse and the car got sucked down to the ground and I smashed my face into the steering wheel (no seat belt) so I couldn't get my foot off the gas so I just pulled the lever back and the car about jumped off the ground and off I went down the xway like nothing ever happened, never hurt a thing except my nose.