I think that if one of her bra strap breaks the weight and force of one of her implants falling will cause the implant to tear through the bottom of her breast. Much like in the cartoons when one tries to save a falling peer with a small circular trampoline only to fail miserably as the falling toon breaks through the safety apparatus leaving a hole in the ground in the profile of the body.
_________________________
"You are the worst poster in xpt yet I can't stop talking about you" - smelly monkey