Object: a single-scent air freshener spray (like cinnamon, or vanilla, or rose as opposed to "mountain breezes scent"). Might want to use a pump bottle instead of an aerosol can less chance of spraying anything in little one's eyes.

Good morning, boys and girls. Are you ready for a little test? Do me a favor: put your hands over your eyes. Now I'm going to spray some air freshener in the air. Can you tell me what that smells like? (Be sure to spray away from the children's faces. Give them a few seconds to guess. Time permitting, you might want to try this with the first few rows of the congregation…