Two Med School Students Try To Guess This Old Man's Problem. But The Truth? Pure Gold

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

Jackson said to his friend: "I'm sure that poor old man has Peltry Syndrome. Those people walk just like that."

"No, I don't think so," his friend Owen replied. "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. 

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

Bert, the old man, replied, "I'll tell you, but first you tell me what you two fine medical students think."

"I think it's Peltry Syndrome," Jackson suggested.

"You thought – but you are wrong," Bert responded.

"I think you have Zovitzki Syndrome," Owen offered next.

"You thought – but you are wrong," Bert repeated.

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

Bert said, "I thought it was gas. I thought – but I was wrong, too!"