Called to a small marina. 15 y.o. boy laying supine in a rowboat, naked except for one sock and sneaker on one foot. He had a lot of "baby fat" though not obese. He had a few "slices" on arms and torso, non-bleeding. The largest was a 1/2 inch deep gash, about six inches long, over left chest, heart area.
Questioning showed he and Uncle were fishing off the rowboat, not too far out of the Marina. The boy was standing when some Yahoos came blitzing by in their speedboat and decided to spin circles around the rowboat. The wake tossed the boy out of the rowboat, into the water and under the speedboat.
Apparently the boy was sucked into the blades of the speedboat's engine, it stripped him of every piece of clothing on him, leaving small slices and that gash, all non-bleeding presumably due to cauterization perhaps by the cold water. All in all, alert, stable, non-injury besides a chill.
The Uncle brought the boys clothes that he retrieved. When we examined his blue-jean jacket, we found a deck of cards, neatly sliced in half, in the pocket right over where the blade had nicked into his chest.