There are four intrepid explorers in a South American jungle. They have been trudging through the jungle, hacking their way through, for months. They have been attacked by wild animals, angry Indians, and some jungle diseases.

One day they come up to a high wall - in the middle of the jungle! What's it doing there? It's very high, so they try to walk around it, right and left, but it stretches for many kilometers, no way around it.

What to do?

There is only one way, they have to climb up over it. They decide that one of them tries it first. They draw straws and one of them draws the short one. He tries to climb the wall but there are no handholds or footholds, so he unpacks his pickaxe and hacks and chops holds for hands and feet, and climbs. It took him 2 hours to get to the top - not a bad effort! The other three watch him swinging his legs over the top and as he looks down the other side, he gives off a terrible loud scream!! And falls off the other side.

Wow, what was that? What did he see on the other side?

The three discuss this, but there is only one thing, they have to have another try, and be more careful. Straws again, and one picks the short one. He tries the holds hacked by the first bloke, but he is taller and they just don't fit him, so he gets out his pickaxe and start chopping and hacking and climbing. He takes 3 hours to get to the top, pretty pathetic effort, but in his defense, he had only days ago recovered from a jungle fever, so he might have an excuse. The two look up as he swings his legs over the top and looks down the other side, and he screams, a terrible bone penetrating scream, and falls off the other side.

Oh shit, again! What do we do? They have to try again. Not straws this time (they have no more straws anyway) but paper, scissors and rock, and one wins (or loses). He tries both sets of handholds and footholds but they don't fit him, he is a different shape, so he has to chop his own too. He gets out his pickaxe and hacks and hacks and climbs. Now he is the athletic one of the four, so he gets to the top in the impressively short time of 90 minutes! Good going! He swings his legs over as the fourth explorer watches him, looks down the other side, and lets out a loud scream that echoes through the jungle, and falls down the other side.

The last remaining explorer paces back and forth, thinking. What should he do? There is really only one thing to do, he has to climb the wall and see what happened to his mates. He tries all three sets of holds but somehow, none of them are useful to him, so unfortunately he too has to chop his own. He takes out his pickaxe and starts chopping and hacking and climbing, hacking, climbing. He takes two hours, just like the first climber, to get to the top, not a bad effort. He swings his legs over the top and looks down the other side, and screams and screams terrible screams, and falls down the other side.