Hopefully I will get to use one some day.
A few years back I was working as a ranger in our local county park, and spent an entire summer cutting down dead oak because of oak wilt. That was before we found out that by cutting these trees in the summer you release those spores. Not good!
I dinged my leg with the saw at one point, tearing into my boot, just below my chaps.
I drove my self to the emergency room, and they patched me up. The funny thing was I was more upset with my stupidity then my leg cut.
I was lucky, only a few stitches. The boot saved my leg.
I was STOOPIDLY cutting brush with my 20" chain saw about 25 years ago - a tooth caught on a springy branch and was thrown about 12 inches to the side - and of course the downward pressure I was exerting tore it into my foot. Fortunately (Thank you again, Lord) I was wearing my combat boots, and the heavy leather and sole stopped the saw almost immediately. It got into my big toe nail about 1/4 inch, but about a dozen stitches fixed me up. If I'd been wearing sneakers, I could easily have lost half a foot.
Went out an bought a small 8" electric to do brush work...
Using the wrong tool for the job can be very dangerous even if your technique is acceptable.