In the year 2000 animator Don Hertzfeldt presented a short by the name Rejected (NSFW)
. This work has been a keystone for the presence of random humour on the internet, and when I say it's NSFW there's a whole scene devoted to a cotton ball that yells "my a*** is bleeding!"
Was it really necessary to add the ponies in lieu of the original characters? Yes. Yes it was. Ponies are an important part of an important part of... society. "Why Rarity and Twilight Sparkle?", for the glory of satan obviously. Really, I could shove any unicorn like Velvet and Wildfire in here and it wouldn't make the slightest difference.