So I was up above Detroit Yesterday night, practicing as usual. My former instructor came in on the radio, we talked a bit, he asked me my altitude and IAS. Replied "I'm at 100 feet and going about 5 and a half thousand." His replay, "are you sure about that Jim? "Yes, oh wait no, no" we laughed, live and learn. Can't diside if this should be here or hanger talk.