What do you do when you get all worked up and want to rant about something, but don't have an appropriate outlet?

Recently, I keep noticing this thing that people say, and it gets under my skin. I resist the urge to correct people, and it has been building and building and now I have a full blown rant in my head… but nowhere really appropriate to share it.
I’ve been known to rant on my Facebook page, whether in a status update or a note, I’ve done my fair share of ranting around Fluther, as well.
Sometimes, it doesn’t seem like the right time or place to get it out… so what do you do when that happens? Do you blog? Journal? Call a friend?