It depends on what they ask you to do. Years ago, I used to work at Knott's Halloween Haunt in California. My first audition, I was asked to act like a shapeshifter. I had like 1 second to think about it. I ended up screaming some help me's as I contorted to the ground and "shifted" into a snake creature where I slithered around on the ground and hissed and screamed.
Kind of weird I know, but I got a part.