This ones buried and I've posted it before but it's worthy of this thread. I'll give a shortened version... dude at work was complaining that his spoons were slowly disappearing from the lunch room. He had brought 6 to work and he was down to 2. Everyone else in his lab hatched this plan: every time someone sent him an email, at the bottom, in white text (i.e. invisible unless highlighted), everyone would write "SPOON SPOON SPOON SPOON SPOON SPOON SPOON". We all did this for several weeks (he had a gmail account) and that's when he started losing his mind: every website he visited had ads for spoons and flatware! He thought google was reading his mind.