Furcadia
Furcadia is . . . well, I don't know what it is. It's split somewhere down the middle between a game and a chat program.
You create a character (a furry of course) and you wander around a large online environment to find other furries to chat with.
It's called free-form role playing. However, very few people actually role play (or at least in my very limited experience). Many of them chat about stuff in real life, many of them simply use the whole thing as an outlet for yiffing.
If you don't know what yiffing is (I sure as hell didn't until I tried Furcadia out) it's cyber-sex.
If you're not already freaked out by a bunch of furries running around and doing little more than cybering all over the place, certain "dreams" (user-created arenas and stages) have edited graphics to add sexual positions to the character's normal movement frames.

What follows is the attempts by various fellow members of the Doom community (including one who frequents Furcadia but loves to ferment mischief), and myself to have fun at the expense of this free online forum.

Players: I (Hyena), Deathz0r, Nanami, SargeBaldy, SlowMotionHobo, BBG, Ralphis
I play as Wallian Creppedonit. Nanami plays originally as Ayoka, but then adds an alternate character (an alt) named The Rug. Other alts surface later as detailed in the logs.

Log notes:
- When the log states "You see (name)" that is an indication that I have clicked on that character. The creator of that character has a written description that follows.
- My side notes appear in asterisks: *such as this*, and are not part of the conversation. - Character's chat actions (like /me in IRC) simply appear as "Wallian Creppedonit eats a cheese wheel"
- [#] indicates a message that is broadcast across the server. - Cookies are a little extra feature. Every day that you log on, you go about "baking" the cookies. When they're ready, you have three, which you can give to other characters but do not count towards your cookie total. (That way, if you want to keep your 3 cookies you need to give them away and have the character give them back). Cookies are essentially useless but are often used as a means of adding to role-playing (such as using them to tip a waitress, or giving them to someone who's upset). They have no real value.
- A "Furre" is a character in Furcadia. That should make everything clear.