This instructable will show you how to make a fake message with powerpoint and put it on your victom's desktop.
Step 1: Step 1: Desktop Screenshot
First, go to your victom's desktop. Open task manager (with control, alt, delete,) and place it wherever you want on the screen. Hold Shift and Print Screen for about 2 seconds, then open powerpoint, and paste there. After that, shape the desktop so it fits perfectly inside the powerpoint slide. Next, insert shapes and text to edit the popup however you want.