Take a look at @syldatk20 on Twitter (The profile has since been suspended so visiting the page will return a 404 error).
This guy's Bio is really, really long. He bypassed Twitter's character limit, but I have no idea how.
The only weird thing I see there is the double space before 160th char. I think there is some special character (CESU-8?), but Twitter just doesn't display it.