Help on finding a story?

I remember reading a story where Rainbow and [Insert pony here] pranked Pinkie Pie and ended up making her disappear from the living.
It includes something about fatal droplets of something that looks like water, grossness, and lots of spasming.

The tags I think are involved:
Pinkie Pie
Rainbow Dash
Sad
Gore

Why am I trying to look for this?
Well, it was the first FanFic I read that was sad, because I didnt read all the tags. I forgot to fave it, which it is my favorite! And because I found this story within a few weeks after joining Fimfiction.net, which I thought then had a LOT of reasons to be in the featured list.
Oh, and it did make it to the featured list.

Edit: Never mind! I found it!

"Visine"