I have a scar by my eye from my aunt’s dog biting when I got too close to her. Another scar right by my hairline from a bottle of Pledge that was left on a table, and I happened to be laying down right at the best spot for it to hit my head.
Another scar or two from a bike pedal impacting my shin.
I’ve had six surgeries that left scars and four that didn’t plus a number of injuries that left scars and embedded metal, etc. I can make it through most metal detectors without setting them off depending on their settings. If I do have to get hand-wanded, it often goes off at odd places.
“Sir, why is the wand detecting metal on the left side of your face and right shoulder?” “Because I’ve got pieces of a helicopter in there.”