Driving with parking brake engaged
We all have done it!
I would assume at some point the drum brakes have generated enough gasses to slide some (brake fade)
I would do as 67Dart273 said in post #2
I am always amazed when I see people doing stationary burnouts without a linelock. the engine has to overpower the rear brakes, a lot of heat generated there too, but no one seems to give it a second thought