Edit, found something:
>If more than one magnet was swallowed, it is highly unlikely that they will pass without surgical removal because of their tendency to bind together across membranes.
What I'm more interested in, actually, is what happens if you swallow just one? Are these magnets strong enough to influence / interfere with the iron in your blood?
Strong magnets are REALLY cool, and REALLY fun. The closest damn thing to magic, in my opinion. I think I'm going to go buy some of these balls before they get banned...