The dumb fucking cleaners I work with...
EVERY day, I blow off the machinery I work with, which causes craploads of dust to spread on the ground below it, yet the cleaners still sweep the cement before I blow it down...
Today, I told them about it and asked them to stop and get out of the way so I could get home sooner, but they were too dumb to understand and continued sweeping.
TOMORROW I JUST BLOW THE SHIT ON TOP OF THEM, THEY WERE WARNED!