I met a guy, who swims with sharks.  Not dolphins! SHARKS! 

A friend and I were chatting over coffee and the conversation drifted over to sharks.  She has an affinity and curiosity about sharks.  I was on the other side of that point of view.  This guy butts in and says he's been bitten by a shark.  My friend claimed that once bitten, you will get bitten again.  Hey.  I would never go back in the water again.  EVER!  She presumed it was human pheromones.  Apparently, sharks have a great sense of smell.  They can hone in on your stank, you can’t smell.