A cop pulls this guy over, and says "Sir, I think you've been drinking. I need you to breath into this Breathalyzer for me."

"I Can't do that... I'm asmatic. If I do that, I'll have a massive heart attack."

"Okay, that's reasonable. Then I need you to come down to the station and we'll do some bloodwork."

"I can't do that either. I'm a hemophiliac. If I do that, I'll bleed to death."

"Well, I guess that's out of the question. I'll need a Urine Sample, then."

"I can't do that, either. I'm Diabetic. If I do that, my blood sugar will get really low."

"I find that hard to believe, but ok. I need you to walk down this white line."

"I can't do that, either."

"Why on earth not?"

"Because I'm drunk"