Three doctors were driving together to the hospital when they had an accident and all three died.

Three doctors were driving together to the hospital when they had an accident and all three died. They found themselves in front of the Pearly Gates, with St. Peter there shaking his head. Gentlemen, I'm afraid Heaven is full - we just don't have room for you here, said St. Peter. But, St. Peter, surely you recognise me! the first doctor exclaimed. I developed the DNA theory, and have helped improve millions of lives through my work. St. Peter shook his head, thinking, and finally said, You're right, we just have to let you in. Come on -- we'll make room somehow. And I know you recognise me, St. Peter, the second doctor said. I developed the MRI, and because of my machine, millions of people with medical problems are helped. Again St. Peter is moved. Yes, come on in. Surely you deserve to be here, too, he replies. Finally, the last doctor pipes in, St. Peter, You must also know me -- I'm the doctor who developed HMOs. To this St. Peter only hesitates a moment, and then replies, Yes, you, too, have a place in Heaven -- but you can only stay 3 days.