Random fact: Because the building is so tall those muslims that live in the Burj Khalifa in Dubai have different times at which they finish their fasting .
Those people who live on the 80th floor and above should fast for a extra 2 minutes, while the people on the 150th floor and above should wait 3 minutes before eating and drinking.
That is true, you must observe the sun disappear behind the horizon, but it's not hard to take the elevator to the lobby ;)
nonetheless this sounds funny :)