psychology
The Shared Laugh Never Forgets
An inside joke is proof that you remember—that the moment mattered, that it's still yours.
humor
The Proof Is in the Joke
An inside joke costs nothing to send and proves everything about how well you know someone.
psychology
The Inside Joke Is Doing More Work Than You Think
Shared laughter isn't just a pleasant side effect of a good relationship — research suggests it's one of the mechanisms that builds one.