Wind them up with the key, let go, and they click open/closed for up to a minute. I do a kidshow routine with them in my book COMEDY WARM-UPS FOR CHILDREN’S SHOWS. Kids love them. Pretend they are your aunt’s teeth . . . let them bite you for a laugh (kids love to see performers get hurt) . . . hold them closed with your hand to stop them . . . start talking again and let go, they talk and chatter and take over again.