During the World War II, an American warship was attacked by the Japanese.
A torpedo was heading towards the ship and a hit seemed inevitable. So the captain told the navigator Pedro to go down to the crew quarters and tell a joke or something… at least they would die laughing.
Pedro went down and said to the crew, “What would you think if I could split the whole ship in two by hitting my diск against the table?”
The crew burst out laughing.
So Pedro pulled his diск out and whammed it on the table.
Just when his diск hit the table, a huge explosion tore the ship apart. The only survivors were the captain and Pedro.
As they floated around in a lifeboat captain asked Pedro, “Well, the crew really laughed. What did you do?”
Pedro told him how he hit his diск against the table.
The captain replied, “Well, in the future you better be careful with that diск of yours. The torpedo missed!”