Two for the geeks, courtesy of xkcd

Firstly, people playing chess on roller coasters. Something I'd be very interested in trying too. Maybe I need to arrange another meeting of the Rollercoaster Police.

Secondly, Randall (creator of xkcd) has also create the bash.org-like Limerick Database. Take a look at the Top 150 for a good (possibly overly geeky) laugh.