No, I did not skip over that at all. I acknowledged it in the grandparent comment, because it was spelt out to me very clearly in the instructions with the first set of buckyballs I purchased. After trying two of the magnets on the membrane between my fingers and noting how powerful they were, it was obvious to me why having them exercising their magnetic attraction for each other in your intestines would be an incredibly bad thing. I did, in fact, realize the danger perfectly well.
This is why I don't put them in my mouth or nose or ear, or let children play with them. Now, while this particular mode of operation is unique to magnets, do you really think that sharp screws or small nails are going to be kind to your intestine?
I think you might be surprised. The internal perforation rate of ingested foreign objects with sharp points is low. People who swallow nails are routinely told to go home, watch for the nail to pass, and contact their doctor if they develop symptoms. The mortality rate for all ingested objects is extremely low.
It is possible that even when compared with nails, magnets are uniquely dangerous.
This is why I don't put them in my mouth or nose or ear, or let children play with them. Now, while this particular mode of operation is unique to magnets, do you really think that sharp screws or small nails are going to be kind to your intestine?