When my family went to Cyprus when I was 18, the tiny metal screws in my head (there to hold my prosthetic ear on) set the metal detector off before the flight back. It wasn't a big issue once we realised what it was and showed them, though.
Mind you, I also accidentally packed my Swiss army knife in my hand luggage and the bloke manning the X-ray scanner responded by telling my dad not to let me do that again and giving it to him to look after, so your (friend's) mileage may vary.
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