On Role Playing Games Stack Exchange, after being off for about two weeks, I noticed, to my great surprise, that I have 201 rep. I had 101 previously (+100 for associated the account). Where did those +100 come from? Not from any questions or answers (I have neither on that site). And to prove the point, my rep graph is completely barren.
I suspect it's just a fluke that will go away at some point.
EDIT: /reputation says:
total votes: 0 -- bonuses (200) -- 2010-12-09 rep 0 = 201 ** rep this week (3/6/2011 - 3/12/2011): 0 ** rep this month (3/1/2011 - 3/31/2011): 0 ** rep this quarter (1/1/2011 - 3/31/2011): 0 ** rep this year (1/1/2011 - 12/31/2011): 0 ** total rep 201 :) days represented 0 rep cap was reached via rep from upvotes *only* on 0 days rep cap was exceeded on 0 days