(This joke is from a professor who refered to lawyers as the second
oldest profession:)

There once was a dog show to determine the worlds smartest dog. Three
dogs were in the finals. One dog belonged to a doctor. One dog belonged
to an engineer. And, one dog belonged to a lawyer.

For the finals each dog was given a bag of bones to see what it could
make.

The doctor said, Stethascope, go! The dog built a human skeleton.

The judges were ready to award the trophy right then. But, they decided
to give the other dogs a try.

The engineer said, Slide-rule, go! (So, its an old joke.) The dog built
a suspension bridge.

The judges were beside themselves. Which dog would they pick?

The lawyer said. Loop-hole, go! The dog ate the bones, got a percentage
of all the tolls from the bridge and screwed the other two dogs.