The old man was a witness in a burglary trial.The defense lawyer asks Sam, Did you see my client commit this burglary?Yes, said Sam, I saw him plainly take the goods.The lawyer asks Sam again, Sam, this happened at night. Are you sure you saw my client commit this crime?Yes, says Sam, I saw him do it.Then the lawyer asks Sam, Sam listen, you are 80 years old and your eyesight probably is bad. Just how far can you see at night?Sam says, I can see the moon, how far is that?