As a young man, my friends and I experimented with clutchless shifting of our standard cars just for fun. I had a Norton Commando that I could upshift and downshift.
One day while all the way across Houston from home, my 427 Chevelle clutch pivot point ball sheared off at the block. I was buying tires and the guy there said I should try starting the car in neutral and pushing it then jump in and try to slip the muncie M22 into first. This did not work at all. The 427 put out about 600hp and idled at 2000rpm, so I could not push fast enough. I then killed the engine and put it in 1st gear and turned the key. The car lurched forward and when it started, the wheels would spin from all the torque. I could shift up into 2nd but did not relish the idea of driving that way all the way home, so I found an auto repair shop nearby and they were able to get the old broken pivot out and get a new one from a chevy dealer to put back in.