Waiter...there's a fly in my soup.

Well, as a return from a long hiatus, this is nothing but a sorry, sorry excuse. However it must be mentioned.
I'm sitting at my desk and hear this fly buzzing OVER the sound of planes following their flight path that happens to go virtually THROUGH our office. Now...my office is on the 5th floor with no opening windows...for a fly to get in here they would have had to do the following...
Slipped in the door undetected and unassuming, while someone else was using it.
Made its way to an elevator and AGAIN slip in during a 10 second or so time span.
At the final floor (occupied by roughly 50 people) exited the elevator, again, flying in the correct direction in a fairly small amount of time. THEN flying down the hall and AGAIN making it through a door in the small amount of time its in use by one of the 4 occupants of our office space.
PLUS flies have a lifespan of 15 to 26 days if they're LUCKY (aka - not squished), so I have to assume that this journey took the entire life of this fly.
Crazy shit, huh?