File this under obvious, but researchers have proven that swearing while experiencing pain does numb the pain. They were even recognized by the (sort of) scientific community for it with an Ig Nobel prize.
The prize is an American send up of the actual Nobel Awards and they are given out by scientific humor magazine Annals of Improbable Research. As you can guess prize winner are those who add to the scientific community with silly or humorous research.
The full report is over on physorg.com
It’s fun and definitely worth a read.