Many years ago, I was in charge of a youth mission trip in DC with 35 senior highs, 7 adults in tow, and $13,000 on Amex Traveler's checks. The first night we were at the Old Post Office food court, and I blithely and visibly handed out $5 bills to each person. I got my food, then hung my purse over the back of my chair, covered by my sweater. When we stood up to leave, my purse was gone, along with all $13K. TALK ABOUT IDIOTS!
I had the separate receipts, and the next day the AMEX office in DC replaced all of the 13 grand. They weren't happy about it, but they did it. I offered to be their poster girl, either for their great service, or for preventable stupidity.