[porsche356a]

I have actually told a version of that joke (the shaggy dog version) at parties...

One day a local marine biologist was collecting gull eggs down at the beach. He had discovered that by mixing the eggs with the dolphin's normal diet, he could vastly extend their life expectancy.

Now, unbeknownst to the biologist, a lion had escaped from the zoo.

On the way back to his car, he saw the sleeping beast blocking his path.

Gingerly he stepped over the cat...

At this point the waiting police arrested him.

The charge?

Crossing state lions with young gulls for immortal porpoises.