A young man was called to be a witness in front of a judge one day.
"Have you ever taken an oath before?" asked the judge.
The young man gave no response so the judge repeated the question again with no response so the judge asked the question differently. "Do you know how to swear?"
"Of course I know how to swear," replied the young man, "you taught me. Don't you recognize me, your honour, I'm your caddie."