An Englishman, a Scotsman and an Irishman are to face s shooting squad.
The Englishman is taken to the wall and the squad was about to shoot when he points behind the squad and shouts "earthquake", the squad runs away and the Englishman escapes.
The Scotsman takes note of the Englishmen's success and when he is dragged out to the wall, waits until the squad were about to shoot and shouts out "Tidal wave", the squad run away and he escapes.
Now the Irishman is feeling really good that he would be saved too but is racking his brain. Earthquake worked, tidal wave worked, what else would work then he smiled and whispered to himself iv got it.
So it is his turn to be at the wall and the shooting squad where just about to shoot, the Irishman with a board grin across his shouts out "fire".