A Reddit user by the name of DrCliche has posted a playthrough of Diablo II, which doesn't sound too strange, until you hear that they did it without attacking once.
The so-called pacifist run took eight hours to complete, and can be watched on YouTube as well. If you really want to know how to do this yourself, DrCliche has even provided a guide, as well as the requirements to make it a pacifist run.
What other games would make for good pacifist runs?