A little puzzle to test your detective skills.. A man who lives in a 26 storey apartment block on the top floor. Arises in the morning washes has breakfast and then leaves his apartment enters the lift and travels to the ground floor then departs the building to go to work. On returning he enters the lift and then selects the 8th floor button, exits the lift and walks the remainder of the floors via the fire exit stairs until he reaches his apartment. He carries this out every time he leaves the building why ????