nurses are supposed to keep track of how many tools go inside you and make sure the same number come out. >> sometimes the initial count going in is wrong. the count going out is wrong. and mistakes happen. >> something gets left behind in as many as 2 out of every 10,000 surgeries. if you have unexpected fever, pain, or swelling after surgery, ask if you might have a surgical memento buried within. ahead on my list, air keeps us alive. so how does it kill this young man? and a mix-up at the maternity ward that leaves moms bonding with the wrong baby. ♪ ♪ ♪ i asked my husband to pay our bill, and he forgot. you have the it card and it's your first time missing a payment, so there's no late fee. really? yep! so is your husband off the hook?