The movie You're Next 3: Pajama Party Massacre is a short film, clocking in at around 26 minutes. It features a crazed killer wearing a goofy rubber mask and killing young women for no reason. It is, in fact, the third such short film featuring the same killer. You're Next and You're Next 2 were even shorter films, both about two and a half minutes long, made by NFTS Productions in their early days. Each of these short films shows a single kill made by the masked slasher.
The first two parts of this trilogy are available on the DVD release of the movie.