A Young man fishing at a creek began packing up to leave. He pulled out his two nets and found a mud crab in one. He put the crab in a bucket of water and put it in the boot of his car. Just as he was closing the boot the park ranger jumped out and collarred him.
"I caught you!" He said, "I saw you take that mud crab. It's not the right season so i'll have to fine you."
The Guy looked at the ranger and said:
"No way mate, that's my pet mud crab. I bring him here every day for a swim."
The ranger was unconvinced.
"Look, " The fisherman said, "I'll put him in the water, he'll take a swim and come back. His name's Martyn."
So he takes the crab out of the bucket, put's it in the water and the two men watch.
Sure enough, the little crab swam around in a circle for a bit, then happily took off Downstream.
"Well, where's your pet crab gone?"
said the ranger.
The fisherman asked: "What crab?"