If you move your cursor to the posters name in a thread and then slowly move it down, the difference between the bold and not bold causes the page to jump as it switches between the two.

Yea, it's Sunday and I have to hang out for work. Guess I'd better work on that Unwired review

Carl

Yeah, who needs drugs?

Peter

whoa..

Trippy, dude

kewl, but is it a bug or a feature?

More of a stylesheet byproduct of the typesetting on the text in question.