Opposite to a private joke, a joke which anyone can join in with at any time. However, because of the possible scale of an open joke, it is much easier to kill and gets old much faster than a private joke.

Due to the nature of an open joke, specific times, people or places are usually not crucial to its execution.

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.