We used to take rental cars on business trips and floor the accelerator and lock up the emergency brake. You could drag that one wheel @ 80 mph for miles, or until it blew. It's value is as a parking brake only.
Same thing happened to my grandmother in her 1972 Cougar XR7. The only difference was that she was in a shopping mall parking lot. My brother eventually reached up from the back seat and pushed the shifter into neutral. It was a broken motor mount which caused the 351 Cleveland to twist in the mount, pulling on the throttle cable.
Your story about your grandmother is PRICELESS. LOL!
That makes a lot of sense. What was your business, juvenile delinquency?