I always write something on the back of my left hand before going to bed. It's usually my dream script, or a list of the things I have to do tomorrow. Tonight, it's symply "RC".

When I dream, I will sometimes look at my hands, and even if they appear normal (without extra fingers or stuff) I will usually remember what I wrote and become lucid.

Besides, it's fun when people try to read my hand during the day.