My first tractor experience was with a 1940 John Deere L when I was 10-11 years old. The tractor was about 10 years old when Dad bought it, and when not in use, it was parked behind the barn, out in the weather. And at least twice that clutch got stuck that way. That little tractor was a 3 speed forward, one reverse, just like the old cars. So when I started it (hand cranked) in neutral, then I could not get it into gear; just grind the gears. So I learned to crank it in neutral, let it warm up a bit, shut it down, put it in the lowest gear, throttle at an idle, then crank it, jump out of the way as it took off slowly, climb on from the back, then hold the clutch pedal all the way down, pull the throttle wide open and stand on the brakes just as hard as I could. And that would pop the clutch loose.
Now many years later, when I bought a brand new Kubota, it came with a particularly shaped block of wood and I had no idea what it was for, until the dealer told me it was to hold the clutch pedal down when the tractor was parked. I never used it, and never had the clutch stick, but I used the tractor very frequently, and kept it parked inside my shop building.