That one old timer who told me my straight edge was off by a hairs width
I was laying out some foundation lines on a site over by the river last summer, and this retired guy walks up, just watching me. I had my 6 foot level and a chalk line, thought I was squared up perfect. He says "your line's off about a 16th from that tree over there." I laughed it off but checked anyway, and sure enough, I was off. How does someone see that from 30 feet away? He stuck around for another 20 minutes giving me tips on reading shadows and wind drift on the string. Anyone else have a random old timer pop up and save you from a stupid mistake?