Haruhi already did it, though it's sadly been lost to time: https://www.reddit.com/r/anime/comments/3xmlb2/spoilers_haru...

I loved the Endless Eight, personally, but I watched them one a day after the event was over. Having read the LNs, I knew what was coming as soon as I got a whiff from the internet of the first episode, so I just held off, waited until it was over, and enjoyed.