Watch Ricky's report
A man is in hospital in Australia after climbing into a crocodile enclosure at a zoo, and trying to ride a five-metre-long croc.
The 800kg reptile called Fatso spun around and bit him on the leg when the man tried to sit on him.
Fortunately Fatso then let go, letting the man escape, but leaving him with serious leg wounds.
The zookeepers said that the crocodile can crush a man to death with a single bite.
Owner Malcolm Douglas reckoned: "If it had been warmer and Fatso was more alert, we would have been dealing with a fatality."