Who Shot Abraham Lincoln?

A not-too-bright candidate for the police force failed in the written examination. Since he was the Chief's nephew, the examiner decided to go easy on him with the oral test.

"Who shot Abraham Lincoln?", asked the examiner.

The candidate pondered for a moment and then asked if he could have sometime to come up with the answer. The examiner told him to come back the next morning.

When the would-be recruit went home, his wife asked, "Well, how did it go? Did you get the job?".

"I think so," he replied. "They have already got me working on a case".