Douglas Harris worked on the 23rd floor of a large office block. Every morning he would enter the lift and press on the button for the 15th floor. He then took the stairs to the 23rd floor. Harris hated walking so why did he behave in this way?

I'm sure I've come across a similar case before. Was Doublas of less than average height, and therefore coucln't reach as high as the button for the 23rd Floor?

Yes. That is the right answer. Sorry I missed your posting, I should have replied earlier.