A cop pulls a guy over. He says, "Alright mac, I'm gonna have to give you a breathalizer test."

The guys says, "You can't do that."

"Why not?"

He says, "I got asthma. You give me a breathalizer test, I'll go into a coughing fit."

The cop says, "Well then I'll have to give you a blood test."

The guys says, "You can't do that."

"Why not?"

He says, "I'm a hemophiliac. I'll bleed. You prick my finger, there'll be blood everywhere."

The cop says, "Well then you gotta get out of the car and walk in a straight line."

The guys says, "I can't do that."

"Why not?"

The guy says, "Because I'm friggin' drunk, you asshole!"