Two medical students were walking along the street when they saw an old man walking with his legs spread apart, stiff-legged and walking slowly.

One student said: "I'm sure that old man has Peltry Syndrome.”

The other says: "No, I don't think so. The old man surely has Zovitzki Syndrome.”

He walks slowly and his legs are apart, just as we learned in class."

Since they couldn't agree they decided to ask the old man.

"We're medical students and couldn't help notice the way you walk, but we couldn't agree on the syndrome you might have. Could you tell us what it is?"

The old man said, "I'll tell you, but first you tell me what you two fine med students think ."

The first student said, "I think its Peltry Syndrome."

The old man said, "You thought - but you are wrong."

The other student said, "I think you have Zovitzki Syndrome."

The old man said, "You thought - but you are wrong."

So they asked him, "Well, what do you have?"

The old man said, "I thought it was ‘gas’ but I was wrong, too!"