Couple of guys are stuck in the desert after a plane crash. They decided to look for help and went wondering around the desert. After a while, the posher of the two needed to take a dump but couldn't face doing it out in the open so held it in. A little while later they both see a dunny just sitting in the middle of the desert, and to make sure it wasn't a mirage they both ran up to it, and sure enough it was real, and posh guy raced in there and and did a dump. But to his horror there was no toilet paper, so he looked around and couldn't see anything he could use but there was a sign stating: 'in the event of no toilet paper, use you hand and the stick it in this hole and it will be cleaned' Sure enough the guy wiped his bum with his hand and stuck his hand in the hole. All of a sudden there was this 'WHACK' as something slammed into the guys hand and he yelped, pulling his hand out and sticking it in his mouth forgetting there was crap all over it...
Horrible joke but at least the guys hand was cleaned...