#38: Do Not Look Into Water Jets
This park sign warns: “Water under pressure — do not look into water jets.” The illustrations show stick figures in various poses of bad ideas, including bending over a fountain like it’s a microscope. Apparently, some people needed a reminder that high-pressure water to the face is not fun.

The humor lies in the sheer absurdity of the warning. Nobody wakes up thinking, “I should stare into a water jet today,” yet here’s a sign begging you not to. It’s equal parts safety advice and comedy sketch, made even better by its cartoon diagrams.
