Are There Rules For Spoilers?

Spoilers can be infuriating because they can ruin the suspense in a piece of media. But some people like them, actually preferring to have the endings divulged. What camp are you in? Why aren't there better guidelines regarding spoilers? We caught up with some of our favorite Youtubers at Vidcon and got their two cents...then they gave us their sixth sense and we found out Bruce Willis was...