Did you hear the one about the prefrontal cortex?
Brain scans reveal the inner workings of humour.
Nature Science Update 21 February 2001
See also: Full text in pdf, and An Interview with Vinod Goel, in which he “discusses two new cutting edge discoveries related to humor and brain activity.”. You can also download a presentation about humour and the brain, but you’ll have to change the extension to .ppt and view it in Powerpoint.