If you haven't poked around Adult Swim's flash games database, then you've wasted less time than I have. And perhaps things should stay that way. But if you're curious enough, there's a game called Creamwolf by Pixeljam where you...well, I'll let the website describe it:
You are a werewolf. By day, you drive an ice cream truck around the local neighborhood, playing your tune and attracting a base of dedicated customers. By night, use that same tune to lure the addicted townsfolk back to your hideout so you can gobble them up, regurgitating them to make new ice cream flavors before heading to the next town to do it again.
It's a multi-layered game. Drive your truck around to collect cones, reel in the kids (who all look like babies) by playing your dinkly ice cream man tune, make sure you construct the cone neatly enough to win their loyalty, don't run into any other cars, and when the moon is full, eat the kids. And do it all while listening to some rad 8-bit tunes.
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