It's called a game of telephone booth. Not one we've heard of before, but then we sometimes think we've been too sheltered, too cloistered. In the game, the contestants standing in a telephone booth (rememeber them?) try to answer a series of questions. Each wrong answer and your booth gets more and more crowded by guests who join you inside.
This being the Tonight Show with Jimmy Fallon, the contestants were Jimmy and his big guest for the evening, Miley Cyrus. And the guests were a collection of oddly shaped and just odd people. A zookeeper with a tarantula, a champion mustache grower, a body builder, a Time Square Elmo, an ET impersonator and, of course, Brook Lopez.