My job colleagues and I are very concerned about security. From time to time, we talk about SQL Injections, XSS, defacements, systems security, wireless security and so on. However, we sometimes forget about most basic security policies: locking your session if you leave your computer for a while.
- Google for a picture of some actor or actress that everyone dislikes or is considered disgusting. For instance: David Hasselhoff.
- Right-click the full-size picture and set it as Desktop Background.
- Restore all windows to hide the brand new background. (If there wasn’t any windows, try locking his/her session).
However, this is funnier if your victim doesn’t see desktop instantly. That is the reason you should cover desktop with windows. (Try opening a web browser and visiting your favorite search engine).
I bet your fellow coworkers will be more cautious leaving their computers unlocked. If not, keep doing it: this prank is always funny.
Windows + L locks your session in Windows.
Ctrl + Alt + L locks your session in KDE.