We all love pleasant surprises. Research shows they play a strong role in our assessment of what makes life happy and meaningful. It turns out that pleasant surprises give life that extra "zing," which makes it satisfying. The catch -- it's not so easy to surprise yourself, but it's easy to surprise others. Remembering this life dynamic can lead to improved relationships. Its that simple. Recall the 1980s "random acts of kindness" craze and the more recent  "pay it forward" fad -- sometimes experienced at a drive-in window when you are surprised to learn the customer ahead of you paid for your coffee. Whether it's buying flowers or surprising a customer with a token gift, research now points to the power of a pleasant surprise to add "zing" to everyday life. Use it!