Two sharks swimming in the ocean come across a group of survivors of a sunken ship.
"Follow me son. Today I will show you the correct way to eat humans" the father shark said to the son shark and they swam to the group of people floating in the water.
"First we swim around them a few times with just the tip of our fins showing." And they did.
"Well done, son! Now we swim around them a few times with full fins showing." And they did. "Now, every few seconds we pop out of the water, open our mouths and let them see our teeth" And they did.
"Now we eat everybody." And they did.
When they were both gorged, the son asked, "Dad, why do all this? Why not just eat them?"
Says the wise papa shark,"Because they taste better when there is no shit inside them!"