I heard you can get a 100-reputation bonus for creating a new Stack Exchange account linked to one on another site that has 200 reputation points already. It's apparently supposed to reflect the fact that you're familiar with the Stack Exchange system, so you don't have to suffer through the new user period (no commenting, no upvotes, etc.).
Is there a way to add a bonus to an already-existing account? I'd think there would be, because if not, I would have waited to get involved on certain Stack Exchange sites until I reached 200 points on another site.