Two sharks (dad and son) swimming in Ocean.
Dad shark says, "Today son, I am going to teach you how to kill and eat humans."
They see a human in water and dad shark goes forward. "Stay here son, and watch what I do."
Dad swims round the victim three times then goes in, kills and eats the human.
"There you go son, got the idea?"
"Yes dad, but why did you circle the human three times."
"Simple son, they taste better without the shit inside them."