In my house it was running the vacuum. TV became unusable.

One of my friends had a really old microwave that would work with the door open. He'd stand there watching his food spin.

He's a weird dude.

Now we have the same effect, but digital: Running the microwave might take out everyone's wi-fi signal in the house. Mine will poleaxe my Bluetooth earphones as long as it's running.

Similarly, my grandma had a set of electric carving knives that would wash out the game on TV every time she started cutting the Thanksgiving turkey.

The modern day equivalent of that happens to a friend of mine. His wifi goes out whenever the microwave is running.

My bluetooth headphones still do this when I use the microwave at work. I have learned to stand back from it when it's in use.