Mark 12:13-17: Paying Tax
If this was not the sermon in a service but the all-age teaching slot, I would start by putting pictures up on the screen of various objects and taking a survey as to: who likes this, who doesn't like this? We could have things you might eat or activities. We could have some sports, some hobbies. Who likes stamp collecting? Yes? No? And then I would end with: who likes taxes? And everybody would say, "Boo! No, we don't like taxes."