It is rude to mow your lawn at midnight.
Dave cannot sleep and is wandering around the house aimlessly in the middle of the night.
Dave wants to find something productive to do.
Dave decides that he needs to finish doing his taxes and grabs his files to begin calculating income.
Dave decides that his lawn needs a cut and fires up the John Deere inside the garage causing a loud rumble.
Dave's neighbors sleep well through the night and wake up refreshed in the morning.
Dave's neighbors are angry with him for waking them up with his loud noises.