Father of a 1week old with ADHD here. I have considered switching to IV nutrients every time my body went into sudden emergency shutdown from an acute lack of food and/or water for the last week...
I once did one where the screen would "crack" whenever you clicked. Like one of those desktop destroyer Minigames that were popular back then. It basically displayed an empty window in the foreground that would then load the cheap-ass crack-lines I had done in MS Paint. It was really obvious, since the program would even appear in the app shelf thingy of MacOS, yet ppl just freaked out every gawd damn time.
Oh, I've wirtten the odd prank virus for Mac in my time. Never spread them through the internet of course, but Mac users felt so secure they'd execute about anything and be terrified when the CD drive started acting up