Vinyl Scratch, known as the famous DJ Pon-3, loves her work and wants all the ponies there to have fun. So when she is performing at one of her regular clubs and sees one pony harrassing another, Vinyl decides to step in and deal with the issue directly. Unfortunately some ponies are not very willing to talk sensibly.
[This idea was inspired by the image Vinyl (contains a nosebleed) created by ReiDuran (devianart) and this comic]