During our morning lectures in residency, most people didn't take notes. But our chief resident always did. Except one morning, I guess he forgot to bring paper, because he started taking notes on a cup.
So yeah, as I watched, the chief actually started copying slide points onto his styrofoam coffee cup. Then when he ran out of room on the cup, he started taking notes on his hand. I don't know what would have happened if he ran out of room on his hand. I don't want to know.