The Brexit Unpleasantness function.
Mention the 'B' word, and the moment you hit enter the forum will send an automated email to the MoD, who will dispatch officers to your abode to dispense a range of punishments from a moderate tasering through to having your home town nuked, the severity dependent upon the whining tone of the post.
Repeat transgressors trigger an automated email to the Kremlin, in which it will be alleged that you called Putin a girl. You might be advised to stop taking sugar in your tea after that.