Maybe this one could be better than the one I put on you'r friend's challenge page comments :

'Two poor personns are walking in a street. Saying "Oh damned... What can we do to earn money..." they stop infront a shop, selling really expensive shoes. They enter the shop to ask the seller why are they so expensive, when he answer them :

• "They are from crocodile"
  The two guys look themself, a brillant idea seeming passing in there mind.
  The next morning, they are flying to Afrika with all the money they remained them, and a shotgun (yes... they have a permission to take it in the plane....).
  Any way, first feet on Afrika's ground, they start searching a river. One time found, the take a bark, and begin shoting crocodile : each time they kill one, his body come up to the surface water, the stomach up.
  First one : "Oh damned... Look at this.... let's kill an other"
  Second one : Shit... It isn't good either..."
  Third, fourth, fiveth.... After a day killing crocodile... They take the plain back, sad and desperates.
  Arriving in front the shoes shop, they say to the seller :
  " - We are damned, spent our last money to go Afrika, spent a day killing about 50 crocodiles, and no one of them had shoes..."

Hope you enjoyed ;^) See you !