Here’s something crazy and pointless: did you know that LCD monitors draw single pixels by mixing three individual red, green and blue subpixels? It’s true! In fact, some devices (like mobile phones and handheld gaming devices) actually use this to anti-alias text and make borders more distinct. Microsoft even use it on laptops running windows with a technique called Cleartype.
I’ve made a little program that uses this technique to create a ridiculously small font, only visible on LCD monitors running at their highest resolution. Each letter is only 1 pixel wide and 5 pixels high, but should be legible nonetheless if you look really closely. Behold!
[Edit 24th Nov 2010]: Hi, ycombinator! If you’re having trouble reading this, a guy called alanfalcon on your comment thread took a photo of it so you can see what’s happening: https://www.flickr.com/photos/dafalcon/5204413187/in/photostream/