When I was a kid, my mom put a lot of effort into teaching and reminding us to cut up our food into small pieces to make choking less likely.
I don't know if this story is true, but she would always reference how a relative of hers had gotten steak stuck in his throat, couldn't communicate that, and died in the middle of the dining room seating, surrounded by relatives I guess just thought he was being quiet.
I think, as someone else said, things installed into the body are usually titanium and thus non ferrous. Fortunately they don't generally cause issues with MRIs as a result.
(I only know this because when I broke my ankle, during the pre-surgery interview, I asked the surgeon about going through metal scanners at an airport.)
I don't recall where I originally read the joke but I spent years - unsuccessfully - trying to find it again. The version I read followed it up with something like "hard as a rock, dumb as a brick."
I soon expect to have screws implanted in my spine. I also have other infirmities. I hope like hell to never have screws ripped through my vertebrae by an MRI.
Once I showed the movie Gattaca to some friends who had never seen it. All of us had comments to make about it and every time anyone talked I paused the movie so people could make their observations, ask their questions, etc.
A bit later after several pauses my wife said "we've been watching this movie for 45 minutes and we're only 10 minutes into it."
Defeated fires?