Let the joke live out its life

When someone starts a joke you know, it is easy to stop them:

I know this one.

Technically this saves time. Socially it says the teller’s pleasure has no value.

A joke exists for more than its unexpected ending. People enjoy the ritual itself: choosing the moment, the listener’s reaction, laughing together.

If the story is short, you can let it reach the end. Especially if it matters to a child, to an elderly person, or to someone telling it for the first time to you specifically.

You do not have to feign amazement and fall off your chair. It is enough not to take the line away.

At the tenth version of the same story it is acceptable to acknowledge gently that you know it:

I think I have heard this one, but remind me how it ends.

Is this the one about the train?

In close relationships repetition is unavoidable. Memory ages, favourite stories stay, and people sometimes tell them not to convey a new fact but to return to a shared past. Saving thirty seconds is not always a good deal.

A child bringing home a riddle from school usually suspects the adult has heard it. What they need is not the riddle but the thirty seconds in which the adult pretends to be thinking. Someone who answers immediately and correctly saves those thirty seconds and simultaneously reports that the game was unnecessary. By the tenth time the child stops bringing riddles home, and that is a result of the trade too, just a deferred one. The thirty seconds turned out to be worth more than they looked at the moment of saving.

Adults work the same way, just less openly. The line “I know this one” is technically true and almost always says nothing about information and everything about the queue: whose turn it is now.