A koala is sitting up a gumtree chewing on eucalyptus leaves, as they do.   You may know that eucalyptus leaves are Koalas only diet, and they are fairly narcotic in their effect.  Which is no doubt why Koalas are so mellow in temperament, and why they wont eat anything else.

Anyhow, he's sitting up his favourite gum tree when a little lizard walks past and looks up and says "Hey Koala ! what are you doing?"

The koala says: "Chewing up on some gum leaves, come up and have some."

So the little lizard climbs up and sits next to the koala and they have a few bunches of leaves. After a while the little lizard says his mouth is 'dry' and is going to get a drink from the river.  But the little lizard is so stoned that he leans too far over and falls into the river.

A crocodile sees this and swims over to the little lizard and helps him to the side, then asks the little lizard: "What's the matter with you?"

The little lizard explains to the crocodile that he was sitting eating the gum leaves with the koala in the tree, got too stoned and then fell into the river while taking a drink.

The crocodile says he has to check this out and walks into the rain forest, finds the tree where the koala is sitting chomping more leaves, and he looks up and says "Hey you!"

So the koala looks down at him and says "Duuuuuuude!.......how much water did you drink?!!"