For a quick drive-by pranking, just hit crtl+windows+c. It enables grayscale mode in windows. It's harmless & easy to fix, so a good office prank. A good rev

For a quick drive-by pranking, just hit crtl+windows+c. It enables grayscale mode in windows. It's harmless & easy to fix, so a good office prank. A good revenge on the manager who puts salt in unattended coffee cups.