I've had two thumb related injuries, although non of late. I drilled through my thumb nail once when making a battery box and on another occasion, the bonnet fell on my thumb from the upright position. I don't know how it did not break but it was one of the most painful things I've ever experienced and I was very close to blacking out
I smacked my thumb with a lump hammer when knocking out radius arm bushes, full blown blow from above head height. Urt a lot, then had to Finnish fitting bushes and radius arms as it was booked in for the mot.