Brain or muscles?
The strong young man at the construction site was bragging that he could outdo anyone in a feat of strength. He made a special case of making fun of one of the older workmen. After several minutes, the older worker had had enough."Why don't you put your money where your mouth is," he said. "I will bet a week's wages that I can haul something in a wheelbarrow over to that outbuilding that you won't be able to wheel back.""You're on, old man," the braggart replied. "Let's see what you got."The old man reached out and grabbed the wheelbarrow by the handles. Then, nodding to the young man, he said, "All right. Get in."

A truck driver who had been delivering radioactive waste...
A truck driver who had been delivering radioactive waste for the local reactor begins to feel sick after a few years on the job. He decided to seek compensation for his ailment. Upon his arrival at the workers' compensation department, he is interviewed by an assessor. Assessor: I see you work with radioactive materials and wish to claim compensation. Trucker: Yeah, I feel really sick. Assessor: Alright then, Does your employer take measures to protect you from radiation poisoning? Trucker: Yeah, he gives me a lead suit to wear on the job. Assessor: And what about the cabin in which you drive? Trucker: Oh yeah. That's lead lined, all lead lined. Assessor: What about the waste itself? Where is that kept? Trucker: Oh, the stuff is held in a lead container, all lead. Assessor: Let me see if I get this straight. You wear a lead suit, sit in a lead-lined cabin and the radioactive waste is kept in a lead container. Trucker: Yeah, that?s right. All lead. Assessor: Then I can't see how you could claim against him for radiation poisoning. Trucker: I'm not. I claiming for lead poisoning.