I've only been there twice and both times some alarm goes off and it does this
"Attention Please! Attention Please! An incident has been reported within the building, please listen for further announcements" making us all want to run out and scream whilst being told not to, and it does this about ten times before changing and saying:
"Attention Please! Attention Please! There is an emergency within the building. Please evacuate immediately!"
Yeah hardly the worlds biggest problem however it's just so scary because the voice makes it sound like you're gonna get bombed 
Anybody else ever had this?