This morning my StackOverflow rep was about 443, then suddenly it jumped to 643 - when I looked it seems that 25 minutes ago somebody upvoted about 30 of my posts, giving me 10 rep points for the first 20 of these.
Is somebody just messing with me, or what? I assume this had to be a single anonymous benefactor at work; will the site recognise that and undo it all?
(At least the whole thing lead to a legitimate extra 100 points because when I came here to ask this question I had to register a meta.stackoverflow account which apparently pays a bonus when linked to a normal StackOverflow account.)