Billy Bunter in Brazil

"I'm going to sit on that log and rest a bit," said Bunter. The log was half-embedded in the mud and it was the first solid object Bunter had seen since entering the swamp, so he was going to sit on it.

"Look out! " shrieked Bob, as the log begaan to move. "Oh, crikey! " shouted Bunter. The log heaved up, revealing that it had a head at one end, and a tail at the other. Bunter's eyes almost popped through his spectacles - he had very nearly sat down on an alligator!