IIRC, he thought he was from a TV show.
Nevermind, that was the strange Jesse whats-his-name!
Since you know only the one true case and you don't know of any allowable FALSE cases you cannot calculate the probability. If you come along and find a coin laying on the ground and you see only a "head", would you then calculate the probability of it being heads by then assuming there are infinite possible ways the coin could land therefore it is impossible (due to the high odds) that it would land "heads" inspite of seeing it with your own eyes.