Intelligent human life will one day look back upon signatures as we do now on royal ring imprints into wax seals. Utterly and completely meaningless (and probably even less so than my example); which is why, I suppose, every single random doodle I make at checkout registers always yields "SIGNATURE ACCEPTED."

I literally once ran a passport through the laundry in Germany, and it faded the signature out. They made me re-sign it on departure. Guess that settled who I really was once and for all!