Rant and Rave, Cry and Complain
Another forum I frequent has a thread set aside for people who need to vent or go on long-winded rants about whatever it is that's on their mind;it's fairly interesting to read so I thought I may as well start a similar thread here.
Post whatever it is that you need to get off your chest, be it a non-nonsensical rant about your jackass of a coworker or an essay on how amazing your boyfriend/girlfriend is. It can be as simple as "I hate owls" or a wall-of-text devoted to that funky smelling kid in your class. It doesn't have to be negative either, just post what ever it is that's on your mind.
-----
People should leave you the fuck alone when you've (politely) made it abundantly clear you'd rather be by yourself for a bit.