I voted for the problem at work. Lets face it if anyone pulled the server logs and time sheets for Stevie they would have a pretty easy case of theft of services. Posting on company time using company bandwidth is theft of services. I have never bought the "but it was my lunch hour" defense, although some companies actually do allow employees to use their resources during personal time. A person who has a half hour unpaid lunch who shows two hours on DU ( or any other non work site) is guilty of theft. Any one want to speculate that Stevie spent way more than his lunch period per day logged into DU? (and I don't buy the 'I forgot to log out when I went back to work' defense either since post times and server logs can disprove that too.)
Then too there are those public servants who park their truck near an open wifi (for a free ride) to surf the watching porn and drinking coffee on their company laptop. They can be a bit harder to catch since they are usually smart enough to dump the browsing history on their machine. Of course they are often turned in by 'concerned citizens' who happen to see them in the same spot every day for hours on end.
The other theory is "the bad ice cube" . If Stevie bought a keg and didn't have all that many folk, well, someone had to drain it since it was paid for.

'looks like Stevie got a bad ice cube last night.'