(Not 'lightning the mood', because we're getting enough of that as it is down here.)

From the 'Girl Genius' Yahoo! group (high volume, low stress, lotsa laughs):

Quarkstomper:

My wife made the observation that reading Girl Genius is even more exciting while holding a squirming ferret.

Of course, just about anything is more exciting with ferrets.

(After a discussion between me and Bill Jackson on the origin of modern commercial bananas) Karrion:

Wow. Anyone else thinking construct bannanas? Bannanastein

And contributed by Michael Telford (it uses Flash):

http://home.cwru.edu/~jnt5/Planarity/