Thought I posted this situation but apparently not. I bought a pair of Danner work boots last year (made in the USA ), great boots and good ankle support.
So there I was with my foot on the tractor step to enter the cab like usual and when I went to move that foot the boot tread got caught in the grid of the step. Having ignored the "always have three points of contact when entering and exiting equipment" I started to fall backwards and at the last moment I grabbed the handrail on the opened cab door.
Falling backwards wouldn't have been kind to my head however I'm a slow learner and almost repeated the same situation a few days later but not nearly as dramatic. I had an instant flashback of the earlier experience.