Computer rearview mirror

Reasons to use it:

The first guilty deed: You are messing around on your computer with some unsuitable-for-children, unsuitable-for-your-boss, unsuitable-for-parents, and unsuitable-for-your-girlfriend stuff.

The second guilty deed: You once secretly scared someone from behind.

The third guilty deed: You offended ghosts or spirits...

(Sometimes, you don't even have to offend ghosts or spirits. Just watching a horror movie might make the viewer quite happy to be able to monitor the situation behind them at any time. But then again, wouldn't this make watching the movie even more terrifying?)

This rearview mirror is 7.6 cm in diameter and can be attached to the side of your computer monitor with velcro.