Mistakes will happen

A big Irishman strolled into the Civil Service room where physical examinations for candidates for the police force were held.
"Strip," ordered the police surgeon.
"What, sir?"
"Get your clothes off, and be quick about it," said the doctor.

The Irishman undressed. The doctor measured his chest and sounded his back.
"Jump over this rod," was the doctor's next command.

The man did his best, landing on his back.
"Double up your knees and touch the floor with your hands."

The Irishman lost his balance and fell sprawling upon the floor. He was indignant but silent.
"Now jump under this cold shower," commanded the doctor.
"That's funny," muttered the applicant.
"Now run around the room ten times. I want to test your heart and wind."

This last order was too much. "I'll not," the Irishman declared defiantly. "I'll stay single."
"Single?" inquired the doctor puzzled.
"Single," repeated the Irishman with determination. "What's all this funny business got to do with a marriage license anyhow?"
"Oh," cried out the doctor laughing, "poor fellow, you have strayed into the wrong bureau!"