You shouldn't take things without someone's permission.
Brian's bicycle tire is flat, and he knows that his friend has a bike pump in his shed.
Brian wants to use his friend's bike pump.
Brian knocks on his friend's door and asks to borrow the bike pump.
Brian walks into his friend's shed, takes the bike pump, and leaves.
Brian's friend lets Brian use the bike pump.
Brian's friend's mom comes out of the house and yells at him, thinking that he's a thief.