So I decided to let Tux, my giant stuffed penguin, have a go at it instead. I used CamTwist to give him a friendly caption: "Hi, I'm Tux. Have a nice day." Then I sat just off-camera and watched the fun, with outgoing audio disabled. I occasionally made Tux wave, nod, or wiggle, but never changed the caption or typed anything into the chat.
This little diversion was way more fun than it had any right to be. Here are a few screenshots.
(Note: My screenshots are worksafe, but the Chat Roulette site itself is most definitely not.)