This remind of my dad and his friend from Cuba. Dad took his friend out on his yacht , and told him not to swim in the water as there were sharks!
The guys got drinking and my dad friend decided to go for a swim against my dad warning! Dad starting yelling Shark, SHARK, it is right behind you, his friend think dad is fooling around, until he looked behind him and see a huge gray fin moving toward him! He swim back to the yacht as fast as he can , and dad try to pull him up but he is big man and they both had a few drinks.
Dad was finally able to pull his friend out of the water! It was a good thing dad friend was not HOH or deaf ! Or that shark would had gotten him!