When DB stands for "Damn and Blast"
I worked for a company who had a similar tale where we ran a competition for a client. The Developer who wrote the competition accidentally forgot to remove a line of test code when the site was deployed live. The result was that at the end of the competition there were some 50,000-odd entries - all with the exact same name and email address. The test code had basically copied the first line of the DB into every entry when a submission was received.
Now - under normal circumstances, you could have covered this issue up because you could have just said - OK then, that first guy/gal wins the prize.
Problem was - there were 5 prizes...
I believe they extended the competition deadline by a couple of days, so if you entered after the deadline, you stood a much better chance of winning.