In The Desert

Three disabled guys (a blind man, an amputee, and a guy in a wheelchair) are flying back with the USA team from the Paralympic games in China when their plane crashes in the Sahara Desert. The three disabled guys (the only survivors) are now stranded and waiting for someone to rescue them, but no one showed. They start to get real thirsty, so they decide to seek out water. The amputee leads the way, with the blind man pushing the guy in the wheelchair; and, eventually, they find an oasis (river).
The amputee leader goes into the water first, cools himself down, drinks a load of water, walks out the other side and lo and behold, he has a NEW LEG! He gets excited and encourages his friends to do the same.
The blind man offers to push the guy in the wheelchair, but he gets refused because the guy in the chair wants to be Mr Independent and insists the blind man goes ahead first. So the blind man goes into the water, cools himself down, drinks a load of water, walks out the other side and lo and behold, he can SEE!
Now the guy in the wheelchair is getting really excited, starts pushing with all his might, goes into the water, cools himself down, drinks a load of water, and wheels out the other side. Lo and behold, his wheel chair developed NEW TIRES!!!