OK - I'm a geek.
If you go to the
forums page you can see how many threads and posts there are in each forum. Not surprisingly off-topic and
anchoring have a high post to thread ratio.
When you click on a forum and go to forum view you can scroll to the bottom and sort by views or reply count.
The Joke Thread is way up there with almost 4,000 replies and 400k views.
A bit weird that you can't do this across all
forums - I didn't take the time to click through each forum...