One performer stands front and center with their hands clasped together behind their back. Another improviser passes their arms through the armpits of the first player. The performer supplying the arms makes a nominal effort to hide behind the performer supplying the body. The audience should see a performer with unmatched arms sticking forward out of their body.
In simplest terms a player will call an elevator and wait for the doors to open. Once they are settled on the elevator other players will get on the elevator and create characters that may or may not interact. Characters will exit and enter the elevator as their floors arrive.