#1: Wait until (preferably jumpy) acquaintance leaves the room #2: Set this as their wallpaper #3: Turn off their monitor #4: Wait for them to come back #5: Surprise obtained
Inkerius said: #1: Wait until (preferably jumpy) acquaintance leaves the room #2: Set this as their wallpaper #3: Turn off their monitor #4: Wait for them to come back #5: Surprise obtained #6: ??? #7: PROFIT!!!!