Clumping (or more dangerous: aligning in a single rigid pole) is not the only danger. Multiple magnets, or magnets and other ferromagnetic objects can attract w

Clumping (or more dangerous: aligning in a single rigid pole) is not the only danger. Multiple magnets, or magnets and other ferromagnetic objects can attract while in different portions of the bowel -- pinching two walls together. This will eventually cause the pinched wall between the magnets to die, forming a hole.