The Pope has it but he does not use it. Your father has it but your mother uses it. Nuns do not need it. Your lady friend's husband has it and she uses it. What is it?
A fireman is running to get a net under a lady who looks like she might jump off the balcony of her 20 story apartment building. There is nothing below her except a 20 story fall. The fireman is still 100 yards away when she falls and can't nearly get there in time. The woman is not hurt more than a bruise. How is that possible?