Goats, condoms and paper clips
Close observers of the BBC News website's "most popular" box might have noticed a rich crop of unusual - and usually old - stories appearing in the past week or two. Examples include Woman jailed for testicle attack, E-mail error ends up on road sign, Condoms 'too big' for Indian men and Man turns paper clip into house.
In 2006, a certain story about a Sudanese goat resurfaced long after it had first been in the news and my colleague Adam Curtis wrote about how the viral potential of the web makes it hard to predict which stories readers will tell their friends about.
We've seen odd stories resurface from time to time - but lately the increased number of such old stories prompted us to investigate further.
We think we've worked out what's going on. Our front page usually shows you the "most shared" list, while pages for individual news stories show you the "most read". In the process of upgrading some of the software which publishes our site, we started to show you "most shared" on story pages as well as the front.
This means that any odd eye-catching story from the archive has been displayed on many more pages than it would normally have been, with the result that more people than normal have read it, more people than normal have then shared it with their friends, and the higher it has then climbed in the rankings.
We're now putting things back the way they were - though doubtless it won't be long before the Sudanese goat makes another appearance, one way or another.
Giles Wilson is the features editor of the BBC News website.