The short first showed up at the Telluride Film Festival in the fall of 2007, playing in front of the mediocre Icelandic thriller Jar City. Once I saw it, I began advising fellow festival-goers to pop into Jar City, if only to see the short. It is startling, hilarious, and better seen with an audience that doesn't know what's coming (Telluride, with its theaters full of upscale patrons of a certain age awaiting the latest arthouse sensation, was ideal). But if you can't make it out to a theater showing it along with The Square, do check out the YouTube version below. I guarantee your satisfaction.
And if you do manage to see The Square, keep an eye out (pun intended) for the blink-and-you'll-miss-it Easter Egg shout-out to Spider during the film's brief hospital scene. It's the rare inside joke that's actually funny.