I have this friend who always seemed to lean slightly to the left all the time. It used to bother me, so I suggested he see a doctor, and have his legs checked out. For years, he refused... told me I was crazy. But last week, he finally went, and sure enough, the doctor discovered his left leg was one-quarter inch shorter than his right.
A quick bit of orthopedic surgery later, he was cured, and both legs are exactly the same length now, and he no longer leans.
"So," I said, "You didn't believe me when I told you a doctor could fix your leg."
He just looked at me and said... "I stand corrected."