OK, check out this Stack Overflow user's rep graph. It's flatlined. At 5,000.
The user has (as I write this) 8 rep.
It shows no recent activity. (Despite the fact that the user has in fact posted in the highlighted timeframe.)
I checked my own rep graph, and it looks pretty accurate and valid. Anyone know what happened with this guy?
(Sorry no pics and freehand circles this time. Not enough time whilst sitting at work. Anyone who wants to, please feel free to go for it.)