How to Create a Fake Prank Awesome And Harmless Virus

Hello! How many of you want to create a Fake Virus to prank someone to feel like a hacker or to prank someone? I am going to create a Fake And Harmless virus with the help of a notepad which has simple codes to display various pop-up windows with lots of messages one by one, which a non-tech person cannot identify that it is really a prank and nothing else.