There is this guy that lives in my building. He leaves for work before me so I never see him leave, but we always get home at the same time and ride the elevator up together; he to the fifth floor and I to the sixth. Yesterday it stormed all day, like cats and dogs I tell ya, and when we rode the elevator in the afternoon the guy pushed the button for the eighth floor.
"Visiting a friend?" I asked.
To which he replied, "Nope, I live in apartment 803."
So why does he normally get off at the fifth floor??
---as the title says, not my riddle, and if you have seen it before let a page or so go by before answering so that those who haven't can try and figure it out