Someone appears, posed as if climbing something, with his hands outstreched and one foot in the air. With the something he was climbing no longer there, he falls two feet.

On the way down he yelps in fright and pulls a cord hanging from his jacket without pausing to think about it. Spring-loaded mechanical wings pop out of the bulky article - and promptly smash themselves against the side of an invisible cylinder.

He observes he has landed on something. "What."