An old man went into surgery to have a leg amputated and the doctors got the wrong one. They went back and amputated the correct leg. Not sure, but any law suit is doomed….he doesn’t have a leg to stand on!

https://www.cnn.com/2021/05/21/health/austria-amputation-wrong-leg-scli-intl/index.html

Years ago, I went in for knee surgery. Prep work included writing and arrows drawn on the appropriate knee with magic marker. One one level it makes sense. On another, it is not a confidence builder.