One thing kids like is to be tricked. For instance, I was going to take my little nephew to Disneyland, but instead I drove him to an old burned-out warehouse. "Oh, no," I said. "Disneyland burned down." He cried and cried, but I think that deep down, he thought it was a pretty good joke. I started to drive over to the real Disneyland, but it was getting pretty late.
When I was a kid my favorite relative was Uncle Caveman. After school we'd all go play in his cave, and every once in a while he would eat one of us. It wasn't until later that I found out that Uncle Caveman was a bear.
We used to laugh at Grandpa when he'd head off and go fishing. But we wouldn't be laughing that evening when he'd come back with some whore he picked up in town.
Or what I used to have in my sig:
Hell no, I don't want to die in a race war. I want to be like 88 years old and sleeping with my neighbor's hot young wife. I want to get caught and then try to escape. Hopefully I will fall over a fence made of methamphetamine and get hit by a Budweiser truck doing 100MPH.