Aunthood/unclehood has to be one of the best roles ever! All of the fun with none of the responsibility. Just be sure that you're the one who does things with them that their parents won't (such as letting them drive when they can barely see over the wheel!).
Anyways...
My boss has two sons. One of them was talking to him on the phone at work today, asking him "How is the Easter Bunny going to know what I want?" (they get them little presents for easter).
So my boss told him that the Easter Bunny came over and that he told him to bring a radio (that's what his son wants). The kid didn't believe him, so I came on the phone and pretended to be the Easter Bunny. It was fun!
Then, a couple of hours later, his other (younger) son called, wanting to talk to the Easter Bunny, so I got to do it again.
It feels good to make children happy.
