A good text for this lesson would be Revelation 3:15-16.

Bring out a Mr. Potato head and set him in a visible place. Tell the kids that Mr. Potato head is here, but unlike any puppets, visitors, ect. that you’ve had before, he won’t be telling any jokes, or talking to anyone, or telling any stories or anything like that, because …well… he’s a potato. » I want to read more! »