The chief constable was interviewing three candidates for the job of detective. He called the first one in, showed him a photo and said, "This is a photo of a suspect. Look closely and tell me what you make of it."

"Well, sir, the man has only the one eye."

"You fool! It's a profile photo and you can't see his other eye! Get out!"

He called in the next candidate, showed him the photo and asked him the same question.

"Well, sir, he's got just the one ear..."

"Idiot! There's no way you can tell that from his profile! Get out!"

In came the third candidate and he was asked the same question.

"Well, sir, this man wears contact lenses." The chief constable pored over the photo and he couldn't see how the chap could have made such an assertion, but he decided to check the suspect's records. He discovered that the suspect did indeed wear contact lenses.

"That's quite remarkable," he said to the candidate, "Tell me, how did you work that one out?"

"Well, sir, as he's got only one eye and one ear there's no way he could wear ordinary specs..."