Some time ago, we used a knotted handkerchief against forgetfulness. Today, hardly anyone wears a handkerchief, but the new technology can help. You can tie a knot on your USB band, and - Voilà! When you see it, you will surely know that there's something that you should remember.
I'm currently working on a special knot for USB 3.0 flashes, which will make you remember even faster.