Sharing screen grabs and screencasts is a great way to show someone exactly how to do something with their Macs. You've got several choices for screencast software (here's a list of posts in our screencast category), but snapping a simple screen grab is much simpler.
- Shift + Command + 3 produces a snapshot of the whole screen
- Shift + Command + 4 produces a crosshair that you can drag over a specific area of your screen
- Shift + Command + 4 followed by the space bar turns the crosshair into a camera
That's great and all, but for some real fun, take a screenshot of a collegue's desktop, move all his desktop icons onto his hard drive, set your screenshot as the desktop image and feign ignorace while he clicks furiously on his "icons." You're welcome.