LOL, Roger, Bill D, LTS, Troll!
Well, my brother once brushed his teeth with "Ting" (an athlete's foot preparation) by mistake.
Another lesson learned from my then teen-age brother: Do not stick your finger into the face of an open-mouthed box turtle, pointing and saying, "Oh, look! He's smiling at me!"
And, from sad experience, (yes, Kat) I can advise all of you to wash your hands thoroughly after applying Ben-Gay to sore muscles, especially if you're gonna rub your eyes -- or any other sensitive areas on yourself or your partner.
Seamus, don't fry ANYTHING in the nude -- not even in a bikini!
Never bathe a reluctant cat unless you are wearing goalie gear.
Lessons from my childhood years: -Do not attempt to find out whether an iron is on by running your thumb down the surface of the iron. -Do not slide down a snow-covered terrace in your Sunday clothes if you own a dog. -Never put an unknown cocoon in an open jar on top your refrigerator for the larvae to hatch. (We ended up with a houseful of miniature praying mantises.)
Re fish: If you need to separate a fish from other fish overnight, do not place it in a teacup. Fish jump.
Re cars: Never check your oil while the motor is running.
And, if you are a teen-age boy lighting a buddy's farts, do not stand behind him when you strike the match.