Pranks I have played on my kids...
The old standby favorite: The walkie talkie.
About 6 years ago. I put one in my daughters closet before bedtime and after she was tucked in started the growling. She came flying out of the bedroom yelling "Mom! Dad is hiding in my closet and..." and saw me walk in from the carport. Eye's the size of Canada on the child. Asked her why she was out of bed and sent her back in and told her she was being silly.
Waited a few minutes and started growling again over the radio. She came stalking down the hallway a few minutes later holding the radio up between two fingers like a dead fish and giving me the stinkeye.
I tried this on the man cub the other night, and he came out of his room laughing and holding up the walkie talkie and showing Mom what a good joke Dad had played on him.
Almost as much fun as the Headless Horseman prank and the infamous "Dad is a werewolf".