Proof that seatbelt designers need to take into account the minimum safe area a human torso can be in, before damage is caused. Regardless of the piercing, should her belly really have been able to get that close to her back? I think not.
The piercing is irrelevant. Imagine she had been wearing a belt buckle, and got that caught under the belt?
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"There is a time when the operation of the machine becomes so odious, makes you so sick at heart,
that you can't take part" [Mario Savo, 1964]