The lizard explains to the crocodile that he was sitting up a tree with a monkey smoking pot, got too stoned and then fell into the river while taking a drink.
The crocodile says he has to check this out and wanders into the jungle. He finds the tree where the monkey is sitting finishing up a joint.
The crocodile yells up to the monkey and says "Hey!"
The monkey looks down and says, "F*ck man! How much water did you drink?!?"