Write the exact thing you are furious about on a paper plate, tape it to the wall, and throw wet cotton balls at it. It sounds childish, and it does more than swinging at nothing.

What the research says

A randomised trial with bereaved people found that writing out emotion about the loss did little on its own, while writing aimed at making sense of it or finding something in it helped more. A large review of therapeutic writing landed nearby, concluding that unfacilitated written disclosure gave little consistent benefit to people with long-term conditions. Both point the same way: writing with a direction and a specific subject does more than writing that only vents.

Strength of evidence: one line of research. A single study, or a theoretical account.