Psychic phenomena.

A professor is lecturing his students on psychic phenomena. As part of the talk he gives
details about a woman who contacts the police working on a missing-persons case. “She
gives an amazingly detailed description of where to find the body,” the professor says.
“In fact, the detectives find the body just as she’s described it. Now who can tell me
what that kind of person is called?”
While most of the students ponder the question a hand is quickly raised and a reply
given, “Professor. A suspect!”