This reminds me of a very poor decision I made in law school. As is common the urinals in the men’s rooms had writing at the top “1 gpf/3.8 lpf,” meaning each flush consumed 1 gallon or 3.8 liters. So every man was constantly confronted with that conversion. /1
There was a poster, maybe of Mickey mouse, flipping the bird with the caption "Hey Iran". Saw that every day on a store window walking home from school.