OK, ready for a really bad joke everyone?
Two prawns, Justin and Christian, are swimming around in the sea.
They are constantly being harassed and threatened by sharks that patrol the area.
Finally, one day, Justin says to Christian, "I'm bored and frustrated at being a prawn, I wish I was a shark, then I wouldn't have to worry about being eaten."
Just as Justin is fantasizing about being a big, strong predator, a mysterious cod appears and says, "Your wish is granted", and lo and behold Justin is transformed into a shark.
Horrified by what's just happened and afraid of being eaten by his old mate, Christian swims away.
After a while of being a shark, Justin finds himself becoming bored and lonely. Whenever he approaches his old mates they all scurry away.
While out swimming alone one day, Justin sees the mysterious cod again and begs the cod to work its magic and turn him back into a prawn so he can hang out with his friends again.
The cod agrees and Justin is tranformed back into a prawn.
With tears of joy in his little eyes, he swims back to his friends but his old pal Christian is nowhere to be seen.
"Where's Christian?" he asked. "He's at home, completely distraught that his best friend changed sides and became a shark," the other prawns tell Justin.
So, eager to put things right again and end their mutual pain and torture, he sets off to Christian's house.
Banging on the door in an attempt to make up with his pal, he shouts: "Christian, it's me, Justin, your old friend. Please come out and see me again."
"No way," Christian replies. "You're a shark, you're the enemy and not to be trusted. How do I know you won't eat me?"
"It's OK now," argues Justin, "I'm not a shark any more. That was the old me. I've changed. I've seen Cod. I'm a prawn again Christian!"