I had knee surgery as a teenager. The dr brought me a sharpie and told me to circle the correct knee and put an X on the other then he left the room. So I did exactly as instructed. Then I drew arrows to the circle and wrote "Operate here" and drew more Xs on the other leg and wrote "Do not touch". I sat there bored for another 30 minutes writing random stuff all over my body like "You can't have my appendix" and "Why are you looking up here? Focus on the knee". I even had my mom write on my back something like "If you can read this, wrong side. Flip me over. Then I covered up with the sheet and the anesthesiologist showed up. I was told that I said some weird stuff while I was going under, but that is a different story. The surgery went fine, I had to stay in the hospital overnight. When the dr came into my room to check on me, he said that I had thrown off their schedule because when they uncovered me and saw all of the notes that they laughed for 10 minutes. When they finally got their composure, they rolled me up on my side to get me onto the operating table and saw the note on my back and lost it again. He said that the surgery started about 30 minutes later than it was supposed to thanks to my drawings and notes.
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