Spray Can Navals

What is the purpose of the little round spot on the cap of a spray can?

———- from June Montgomery of San Luis Obispo, CA

Those are spray can cap navals, where the umbilical cord connected during their larval stage as thimbles. Like most of creation, nowadays they’re fed growth hormones, steroids which cause them to reach maturity in a fraction of the time it used to take. Consequently, those little round spots are often still quite sore and if you touch them roughly, you may end up with a spray can that sputters, spurts, dribbles and drip. Some of these angry blowhards will even spray you in the eye if given half a chance.