I was recently searching for a question to answer, and I came across this one question with a score of -2, and I noticed this was that particular person's only question, and he had a some sort of reputation bonus of 100. At first I thought he might've won a bounty. Although, he also had not answered any questions, either. Then I was sorta confused, so I decided to check his reputation changes, and I found this:
So apparently he/she won some sort of "association bonus".
What is an association bonus?