An elderly Jewish man is bumped by a car while crossing the street. He is seemingly unhurt, but his wife persuades him to go to the doctor, just in case. He returns home, and his wife says – "Nu, vos zogt der doktor?"
"Der doktor zogt az ich hob a flucky." ["The doctor says I have a flucky."]
"Oy, gevalt! A flucky! Terrible! What do you do for a flucky?"
"I don't know – he didn't say, and I forgot to ask." Well, by this time the wife is in a state of high anxiety. She tells her neighbors "My husband was hit by a car, and now he has a flucky! I don't know what to do!"
Neighbor #1 says, "In the old country, when someone had a flucky, we always applied cold. Ice cold is the best thing for a flucky."
Neighbor #2 says, "What are you talking about? Cold is absolutely the worst thing you could do for a flucky! We always applied heat, that's the only thing to do for a flucky."
Cold, heat, oy! Now thoroughly agitated, the wife decides to call the doctor herself. "Doctor, please tell me, what's wrong with my husband?"
"I told him...nothing's wrong. He got off lucky."