It's wrong to sneak into places.
Once he got home after attending a party at the house of one of his coworkers, Bob realizes he had forgotten his favorite cap there.
Bob wants to get his favorite cap back.
Bob waits until the next day and calls his coworker in advance before stopping by her place to get his cap.
Bob returns to his coworker's place and since the lights are off decides to enter the house through the back door and find his cap.
Bob's coworker gets a good night sleep and is not bothered by Bob's behavior.
Bob's coworker wakes up from the noise, thinks there's an intruder in the house and gets extremely scared.