These are really aweful. The second one, where the strop slides off the bow, almost happened to me, and they  dropped my boat back in the cradle before disaster. Now I always have them tie a line between the two strops, so they can't slip fore or aft.

The main thing we can learn from these is don't be anywhere near a boat when it's being lifted. I don't think anyone was killed in these accidents, but it looks like a few injuries. 

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