The old man was a witness in a burglary trial.
The defense lawyer asks Sam, “Did you see my client commit this burglary?”
“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?”