I accidentally duplicated an answer because I haven't been using Stack Overflow for long enough to know that I could "link" to that answer of mine. As a result, I got 3 downvotes from some super-user and my reputation decreased from 160 to 49! I can't even comment on an answer now. There isn't anything mentioned anywhere about these kinds of punishments.
EDIT not by OP: convenience link for the answer (SO 10k only)