Mike Devine thought Lenny was an intruder because he did not remember the car accident or Lenny carrying him into the apartment. He probably did not remember because he had a concussion. Lenny"s idea was that there was a garage on the bottom of Mike Devine's apartment building. Lenny told mike that he had to move his car and Mike offered Lenny the use of his garage for Lenny's car. Lenny therefore concluded that the intruder could have left the apartment by taking the elevator directly to the garage and driven away without the doorman seeing him or her.