This is totally exactly what would happen if a bunch of doofuses really did make a Portal Gun in their garage or something. Without Chell's fancy long-fall spring boots, the terminal velocity caused by infinite portals on top of one another seems a lot scarier.
Then again, this guy doesn't seem to mind too much.
The video started out as an experiment, using "3D tracking, seamless camera cuts and 3D camera projection," and creator Jason Craft writes that he's surprised how good it came out.
We have to agree—it's sort of incredible. What would you do with a real-life Portal Gun? Tell us in the comments or on Twitter.