I'm pretty sure judo doesn't have kicks.

This is one of those times where it could kill you to clean up...

It was a wicked sports injury -- you just didn't know you were playing.

Wait... you were "on the floor" vacuuming? Do you not vacuum standing up?

He could've been using the vacuum hose to vacuum in the corner near the door, and most people get on their hands and knees when using the hose.

this question also baffles me

That was my first thought too, but if it was a rug in the entry way OP might have been on the floor holding the corners down to vacuum them without it getting messed up... I always stood on the corners for my mom when I was a kid, and once or twice had to get down to fix it when I tried it on my own. Otherwise, I have no clue...!

 Most people? been looking in a few windows have we.

Judo is more wrestling/throwing than kicking. It was probably either a karate, or kung fu kick.

Everyone who ever said that housework never hurt anyone needs to read this FML

I hate to be that guy, but a "judo kick" isn't a thing.