Somebody Has to Say It
It’s quite astounding how many people fail to think before they speak. I’m not referring to the occasional social slip up, but to people who can be relied on to say the wrong thing. Examples of this include handing out unsolicited advice and criticism to strangers. Or stating the obvious when everyone else in the conversation was deliberately trying not to (this is usually done by the last person to catch on to what the conversation is really about).
A piece of advice: before you say anything, pause for just a second, and think about whether you should be saying something, and whether what you’re about to say is appropriate!