Light Bulb - Economist

Q: How many economists does it take to screw in a light bulb?
A: That depends on the wage rate.

Scientist Booty Call - DNA

Want to go back to my place and exchange some DNA material?

A Red Spot On the Dash

A truck driver breaks down and shortly another trucker stops to give him a hand. He notices that the first driver has a big red spot painted on his dash and asks him what it's for. He replies "Oh that's a conversation piece for when I pick up female hitchhikers. I get lots of pussy that way" The other driver thinks that's a great idea so he paints a red spot on his dash too. Then he sees a girl hitchhiking so he picks her up. She notices the red spot on the dash and asks him what it's for. He says "It's a conversation piece. You wanna fuck?"