Twenty questions is a great 'waiting game.' It keeps us busy when we are waiting, and it doesn't require batteries.
Plus, in the best of rounds, I like to think they're learning skills of reasoning and deduction.
"I'm thinking of..." I tap my chin. "A place where you would see a bride and groom."
The first guess: "A circus?"
Well, perhaps. You make a strong point. I've been to a wedding or two that seemed one step away from a parade of elephants.