I found this XKCD cartoon whlie clearing out my mailbox – I found it via PZ quite a while ago now (so it’s probably circumnavigated the world net 3.5 times by now!), but thought it was worth sharing. (Keep an eye out for cuttlefish, Marcus!)
(Many of the XKCD cartoons are hilarious; some I just find quite strange… Must say something about my sense of humour!)