A pop-up on the computer screen that shows a red door and asks, "do you like the red room?" Those who see the pop-up are found dead, and their walls are painted red with their own blood.
This urban legend started with a flash animation of a boy encountering the pop-up and becoming cursed. However, it didn't take off until the Japanese police discovered the young girl who committed a slashing in 2004 had bookmarked this video.
If you are fluent in Japanese and would like to experience The Red Room for yourself, head over here. If you aren't, you can probably still guess what's happening from the picture.
