A man leaves a bar, gets into his car and drives away. 200 yards further he's stopped by a police officer.
Officer: "Good evening sir. We're testing drivers for drunken driving. Would you please blow into this machine?".
Man: "I'm sorry, I can't do that. I have asthma. If I blow on that machine I will get out of air".
Officer: "Please come along to the office and we can give you a blood test."
Man: "I can't do that. I have anemia and if you stick a needle in me I will bleed to death".
Officer: "Then you'll have to get out and walk 5 yards along this white line".
Man: "Can't do that either."
Officer: "Why not?"
Man: "Because I'm dead drunk!"