An ocean liner is sailing in the North Atlantic and hits an iceberg.
As the ship is sinking, one crewman runs to the ship’s captain and tells him to open the root beer caskets in the ship’s hold.
The captain is confused but has no other options, so he orders all of the ship’s root beer caskets cut open. The root beer floods the hold and the ship slowly stops sinking, rights itself, and keeps on sailing.
The captain says to the crewman, “My man you are a genius. How did you think of doing that?”
The crewman replies, “Well captain, it’s simple. Root beer floats.”