Fail happens at the improv theater, when one has made mistakes, which has led to, that the scene has been a failure or the scenes have been a failure. However while the term error is a "substantive", Fail can still involve an additional negative feeling: One has not failed, its demands on itself meet and perceive as small, incompetent, from the track dropped, besides Fail includes often a little destiny, something unalterable.

At the improv theater, in particular at theatersports, the aim is to fail to see the positive: " Fail and be happy".