Camper 1 is on the invisible bench already
Camper 2: (walks up to to Camper 1)What ya doin'?
Camper 1: Siting on this here invisible bench.
Camper 2: Can I join ya?
Camper 1: Sure!
Repeat until all but one of the Campers are sitting on the invisable bench.
Counselor: what are you doing?
Camper 1: sitting on this invisible bench.
Counselor: How can you? I moved it over there yesterday! (pointing somewhere else.)
All the campers sitting fall down.