In my first year at university in my logic course, the lecturer did a little demonstration for us.
He had an embarrassed third year student come in whilst wearing comedy glasses/nose/moustache and carrying a custard pie.
He told us that if he answered the three questions wrongly then the student would put a custard pie in his face.
He answered the three questions correctly and still got the custard pie in his face.
His point was that he only specified what would happen if he answered the questions wrongly, he never said anything about what would happen if he answered them correctly.
The puzzle in the OP only seems to be a puzzle because people assume that one man is always telling the truth and one man must always be telling lies. This is never stated.
He had an embarrassed third year student come in whilst wearing comedy glasses/nose/moustache and carrying a custard pie.
He told us that if he answered the three questions wrongly then the student would put a custard pie in his face.
He answered the three questions correctly and still got the custard pie in his face.
His point was that he only specified what would happen if he answered the questions wrongly, he never said anything about what would happen if he answered them correctly.
The puzzle in the OP only seems to be a puzzle because people assume that one man is always telling the truth and one man must always be telling lies. This is never stated.
