Cracked.com asked its readers to send in posters with their favourite paradoxes, which it then published a month ago. I'd meant to post this earlier, but it doesn't matter. Some of these paradoxes have been around for a few millennia. Here's the link:
http://www.cracked.com/photoplasty_2112_20-insane-thought-experiments-thatll-blow-your-mind/
I like entry number 8.
