A police oficer pulls a guy over after observing him along the roadway. The officer asks him to take a "Breathalizer" test. The guy says: " I can't. I'm an asthmatic and can't do that".

The police officer says:" OK, I'll take you to the stationhouse and you can give us a urine sample.The guy says: " Gee, I can't do that either. I'm a diabetic and my blood sugar will go off the charts!"

The officer finally says: " OK! Step out of the car. I'm going to ask you to walk a straight line!"

The guy says: " I can't do that either".

The officer asks: " Why not?"

The guy says:" Because I'm drunk".