Zork
There are people young enough who would see you playing Zork and think that your computer is broken because it’s running on DOS. What’s scarier is that those people have kids who don’t even know what DOS is. Zork, like all text-based games from the early days of computer gaming is nothing but a black screen, white text and imagination.
Sure it’s not graphically stimulating or even fun by today’s standards, but only the craftiest of nerd dads still have a knack for Zork.