[graton]

I like this video from Philip Bloom who has two vacuum cleaners running at night: https://www.youtube.com/watch?v=OdR0JT652T4

I won't spoil what happens with them :) But the interesting thing happens at about 1:10 into the video.

[woliveirajr]

After I read this one (didn't find the original again but this one explains - https://mashable.com/2016/08/12/roomba-spreads-dog-poop/ ) I decided to not have one in my house.