Context: “My friends used to get mad if you pointed with your pointer finger like that at a rainbow. Didn’t matter how big or small, you point with that pointer, you’d get an earful about how your nose was going to fall off. Always had to point out a rainbow with my thumb and look! I still have my nose.

Analysis: This was a superstition that taught pointing at a rainbow with your index finger would make your nose fall off. It was commonly played amongst school children as a light-hearted taunt whenever anyone forgot. It has no clear source, but is geo-specific, with this particular school the only one in the area that references the belief and it serves as a quick filter for those familiar.