This is a funny prank which will hang your friend's internal processor for a while...
Step 1: Step 1: Go to Your Desktop. Remove All Gadgets From Desktop and Refresh It, and Press Ctrl+PrntScr.
Your normal desktop.
Step 2: Step 2: Open Paint and Press Ctrl+V. Then Save the File at a Suitable Location.
Saving the screenshot.
Step 3: Step 3: Open the Saved Image, Press Right Click and Select "set As Desktop Background."
Apply desktop background
Step 4: Step 4: Now Go to Desktop, Right Click and Select Show Desktop Icons. Un-select This Option.
Step 5: Step 5: Your Desktop Will Appear the Same, But Will Become Unresponsive When Clicking on Icons.
Now call your friend and ask him/her to open an icon. And here comes the prank.