A man decides to go for a bit of adventure, and sets up to cross the desert.
.
He goes to a local camel dealer, buys a camel, loads it up, and off he goes.
Five days in his trip, his camel ups and dies of thirst. Marooned in the middle of nowhere, our adventurer keeps going on foot, and finally reaches the other side, but barely alive.
Once properly revived, he decides he wants to get back at that salesman for almost killing him with a sub-standard camel.
He rents a jeep, and takes off. As soon as he reaches the other side, he bee-lines for the camel vendor and really rips into him. The camel guy just takes a step back, and says:’’ but Sahib! You never said the camel was for a desert crossing! You need a bricked camel to succeed!’’
Our adventurer asks:’’ bricked?’’
‘’ Yes, Sahib, a regular camel will only carry about 5 days worth of water. Since you need at least 7 days to cross, you need a bricked camel’’
Our adventurer says again:’’ bricked?’’
‘’ Yes Sahib, I show you’’. At this point, our used camel salesman picks up one brick in each hand, and starts to walk around the camels. As soon as he comes behind a camel that is drinking, he lines up on each side of the camel’s bag (ahem…) and slams the bricks together.
At this point, said camel just gets a seriously perturbed look , and emits a tremendous sucking sound. The camel guy sais:’’You see! He now has at the very least 2 extra days, worth of water in there.’’
The adventurer asks:’’ Boy! That’s gotta hurt!’’
‘’No Sahib, you only need to keep your thumbs anywhere except between the bricks…’’