Party Central (theatrical; 5:41)
Disney Movies; IMDb; Pixar; Pixar Wiki; TV Tropes; Wikia; Wikipedia
streaming sites: Disney+

This played in theaters before Muppets Most Wanted, but it's actually based on Monsters University. I watched it online, on Disney Movies Anywhere (though it has since been removed from the site). It's available on the Pixar Short Films Collection volume 3. It's a fairly amusing story of Mike and Sulley helping their fraternity brothers steal an awesome party from a more popular frat. I had more to say, but my final review was lost, so I'll have to watch it again sometime to write a new one.