I actually some time ago listened to a podcast (can’t remember the name) where the guy had his little daughter (like preschool) rate his dad-ness on different scales by just drawing a line on the paper and asking her to put her finger on it to show her rating. Though it was apparently biased because that morning the dad had made the daughter brush her hair. In any case, he took sub-millimeter measurements, did the math, and ended up with a number just like that… Which he ofc printed on a mug 😁