Smash open those piggy banks, kids! It's time for a Woot-Off!
Tell them if they don't get this built by bedtime, that an alien is going to melt their brain in their sleep. That'll get their little imaginations going!
One time when I was a kid, my grandma was staying with us while my parents were out of town, and she didn't have lunch money for my brothers, so she broke open my piggy bank and gave them my money. The moral of the story, kids, is that grandmas are mean, and you should spend all your money here before that old witch takes it. Happy shopping!