I had a similar expereince with a karate instructor, of all people. My increasing tardiness from class had become an issue, so he took me aside, stabbed a finger in my direction, and ordered me to "Get healthy!" He knew I'd had a long-term battle with Chronic Fatigue Syndrome, but still those words came out.

Well, why didn't I think of that? I'm sick, so just get healthy, problem solved. (I actually resolved the problem another way, by permanently leaving the class).