Shock and amaze your office mates! Here's the trick – look at the images at a normal distance from your monitor. Which one looks like the mean face and which one the nice one?
OK. Now walk back at least several feet, waaaay back, and look again.
MUHAHAHAHAHA.
The trick's apparently in the way your brain processes fine and coarse information. Click here for more explanation, which won't sound like I'm pulling stuff from out of a dark place.
Now go have fun freaking out your office mates.