Steps to reproduce:
- Visit Programmers - Stack Exchange or Programmers chat in browser.
- Keep page open for a while.
- Notice blemish on monitor at edge of vision, reach with hand or cloth to clean it off.
- Realize that blemish is actually the theme's background image and you just wiped it for nothing/touched monitor with finger and actually made it worse. Possible infinite loop condition.
(P.S. I would've tagged this [fun] if I had the rep. =))