I'll trust them to run with scissors.
You know, that's interesting to me. There's hardly a person in the world whose mother didn't warn against running with scissors, myself included. But she never said a word about running with an ice pick, or a butcher knife. I was likewise warned against going into the water, even if only knee deep, within a half hour of eating so much as a cracker. There was something about contact with water that would interact with recently eaten food, and cause immediate paralyzing cramps and drowning. And reading in dim light or sitting too close to the TV was certain to permanently damage your eyes. For years, I was warned that more than one bottle of Coke per day was a sure ticket to diabetes. I obeyed every one of those cautions, survived, and today have excellent vision and no diabetes.