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The chassis will catch and hide a dropped socket or other small tool before it hits the ground.
Great pie chart!
My mechanic in Pittsburgh was working with his young son (many years ago). As they were finishing, he asked his son to help clean up. The boy took a handful of loose hardware and dumped it down the intake of the engine they were working on! He did clean up... My mechanic told me the next day they took the engine apart... and finished up with more specific clean up instructions!
Up until now I thought the worst stories of junior helping Dad around the car was using a scotchbrite to "wash" it. This one may beat it.