I have a different kind of blackmail if you want to call it that way from my wife. It happened yesterday for me - I took my wife to one of the premium outlet malls in NY. I wanted to get her a Coach bag or a Movado watch for our upcoming wedding annivesary - Guess what she said? "I do not want these as using it on everyday basis, I will be worried that I might scratch or tear it, I just need some good looking bag or a watch" - And she got a Michael Kors bag which cost me very less than what I had in mind.
Lucky me I have a smart-thinking level headed girl as my wife and now I want to spend even more for her next time I go shopping