Oh, and this story is not good.
When I was about 14 I went out with my Dad to work in a JCB which needed something doing under the bonnet. This was a fairly new 3CX which he had recently bought, having mostly 3C's (if you know your JCB's you will know what I mean).
Anyway, I got in the cab and he told me to lift up the front bucket and cut the engine, which I did. He was working under the arms, one foot on the front wheel and the other on a little ledge on the chassis, under the front arms. After he had done he told me to lower the arms, which I did. Then he shouted at me to start the engine and lift the arm and he duly jumped down and looked pained. The 3C's had about a 4" gap between the ledge on the chassis and the hydraulic ram that lifts the front arms so you could have your foot on there and lower the arms easily. The 3CX had about an 1" gap which my Dad didn't know and lowering the arm trapped the steel toecap, crushed it and then crushed his left foot.
And he had to drive 20 miles home as I was too young and didn't know how to drive.
He was in a lot of pain at home and Mum told him he needed to the hospital as he was obviously in pain and it was pretty serious. So he begrudgingly went and was admitted for quite a few weeks and due to the injuries and the ensuing gangrenous infection he was lucky to have only had half of the big toe on his left foot amputated, and the bones in the index toe (if that is the right name for it) fused. He was very close to losing his foot. And he won't wear toecaps now as these prevented him from being able to remove his foot when he felt the arm come down.
Although it wasn't my fault I still feel guilty to this day and it's been 26 years.