Three people crash-land in a plane in the desert...

... the two guys and a girl survived the crash but are left without any supplies what-so-ever, except for a small bag of flour.

For two days they wait for rescue but nothing comes. They drink their own urine to stave off thirst but are now very very hungry.

One of the guys gets a brilliant idea, "we'll use the flour and make a damper" (simple bread) he says. "how do we make damper without water?" the others ask. "And how do we cook it?"

"Well, it's easy to cook in this heat" the first guy replies "and we can make the damper by pissing in it". Everyone nods in unison.

So, the first guy spreads the paper flour-bag on the sand, piles the flour in the middle and makes a divot in the centre to accept the 'liquid'. He kneels down before it and attempts to pee. He struggles and squeezes to no avail, he's dry he pronounces. They feel saddened at his failure.

The second guy kneels in the sand before the flour. After a few minutes he too grimaces in disgrace at not having any piss left. The all feel bad. So the girl says that she will now have a go at pissing into the little bowl of flour.

After removing her panties she carefully squats over it and makes an attempt. Nothing comes. She says "Wait, I feel it coming". She squats closer and squeezes hard.

Just then, her facial expression changes, she farts and blows all the flour away and they all piss themselves laughing.