I've had it happen twice with Mastercard in the last year or two. In both cases I made a small purchase at a fast food restaurant, followed immediately by a la

I've had it happen twice with Mastercard in the last year or two. In both cases I made a small purchase at a fast food restaurant, followed immediately by a large purchase. This was one of their triggers, which makes sense. Thief tests card, then immediately tries to max it out. It nearly caused me a huge problem the first time since I was purchasing an engagement ring and they called my now fiancee regarding the transaction. Thankfully they didn't give any details but it still meant I had to lie about it all about which I was not pleased.