It's a clip from a 12 minute 1980s promotional video for Windows 386 which, up until this point in the film, is quite normal and dull. But something happened in the production studio around the 7 minute mark, and clearly the monkeys working on putting this thing together collectively lost their minds.
Should you wish to see the video in its entirety, you can click here. Otherwise just enjoy the below snippet.
And if you're wondering about the title of this post, wait until the 3.10 mark.