"... Everypony says I've gone insane... But... I'm the only sane pony left..."

The rainbow maned pegasus, Rainbow Dash has fallen quite lonely. Her friends have become quite a bit too busy for her shenanigans, and seem to blow her off when she asks. Her days now consist of isolation or flying alone...
Rainbow Dash, while flying one day, finds a bottle with a bright purple label saying 'FUN!', as well as a pink liquid to it's brim. She doesn't know who made it, or what it is, or how it even got there, but hey, what can a bottle labeled Fun do to hurt anypony?

... Right?