Not Ranked
I have seen pistons come apart cleanly into two big pieces, split right through the wrist pin hole. The top half gets crammed into the head, smashing valves and the sparkplug. The bottom half gets chucked down into the crank and rods where it gets chopped into pieces like it was dropped into a cuisenart. Rod bounces around in cylinder destroying everything and ventilating the water jacket. The top half of the piston, which is just a flat disk gets beat up and can come apart and have it's bits fall into the pan.
Never seen it happen at low RPM however, only after critical piston speed was exceeded (ex: 5th to 2nd downshift)
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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