Excellent excuse to tell the wife right after the Target sale!
(Seriously, that sucks. They'd need to come up with serious safeguards in the system, but do they care? Hopefully you get reimbursed relatively easily.)
@Turbo AmEx is pretty good about catching them, but since I regularly shop at Target it missed this one. They're a lot better about fixing it quickly than my credit union is with my debit card. Using debit cards is just not worth the hassle these days.