T/ AskReddit WAdventure84 6h What evil prank have you pulled off? Discussion 23.5k 5.8k Share BEST COMMENTS Troidin 3h 8 Awards My mum’s laptop wallpaper was a picture of her granddaughter: copied the picture 100 times and made her wallpaper a slide show of the same picture over and over again; so the file would change but nothing would change visibly the monitor: The pictures would change every 10 seconds: one of the images | painted a tiny little curly moustache on her: So randomly for 10 seconds my niece would have a moustache. My mum thought she was either losing her mind or had a computer virus and everytime the moustache popped up,it was gone by the time she tried to show anyone Replv 12.6k on On