Once Albert Einstein was traveling on a train from Princeton when the conductor came down the aisle punching tickets. When the conductor reached Einstein, the great physicist reached into his vest pocket, but couldn’t find his ticket. So he reached into the pockets of his pants, but still he couldn’t find the ticket.
The conductor said, “Dr. Einstein, it’s ok. I know who you are.”
As if not hearing these words, Einstein continued searching for the missing ticket. As he opened his briefcase to look inside, the conductor said again, “Dr. Einstein, we all know who you are. I’m sure you bought a ticket. Please don’t worry about it.”
Einstein nodded appreciatively. The conductor continued down the aisle punching tickets, but behind him he could see the scientist down on his hands and knees looking under his seat for the missing ticket.
Rushing back to him, the conductor said, “Please, please Dr. Einstein, do not worry. I’m sure you bought a ticket. We know who you are and really, it’s no problem.”
Einstein stood up, looked the conductor in the eye and replied, “Young man, I too, know who I am. What I do not know is where I am going.”