I knew that my wife always got a glass of ice water from the refrigerator when she came home from work, so I put some roses and chocolates in the refrigerator so she would be surprised when she got her water.
After my ex and I broke up, flowers arrived at work and one of my more socially-idiotic co-workers said, "Well, we know they aren't for Jessica!".
There is hardly any worse feeling you can get in life than to have high expectations that your gift is going to be fawned over (or better yet that YOU will be for giving it) and then to be humiliated by finding out that you gave the exact wrong gift; worse yet that your gift offended a room full of people. It's happened to me many times, but by far the most humiliating was one cold evening in a beautiful restaurant in Moscow.
