I searched and searched, and can you believe that there is NO thread devoted only to Sharpies? How on earth can we have missed this?
Love 'em, hate 'em (?!), can't do a show with out them! Sharpies rule the world.
However, did you know that if you mark white gaff with black sharpie and leave it on a wall for a while (like labeling a costume hook for a show), when you peel it off, the black paint that was under the sharpie will come with, leaving an outline of the words you wrote? Use masking tape; it won't mess up your paint.
Or that if you mark on pale skin with (I think it was) green sharpie, and wash most of it off, the residue will glow under black light? (I discovered that one doing marker tests on myself for a stage tattoo that had to be washed off between scenes, in a show that also had an, unrelated, black light.) I'll bet someone will find that tidbit of trivia useful someday!
And of course, you can temporarily touch up any chips in black paint on the stage or walls.
This post brought to you by the fact that I just cleaned out the pen cup on my desk (procrastinating cleaning the hamster cage). There were 8 Sharpies in 4 different colors and 3 different types. No wonder I could never find a Sharpie around the house when I needed one, OR fit all my pens in the cup. Gods, I am such an SM.