Miami easter egg!
After rescuing the guy in the manager's office(before going to the girl in the vault, if it won't work go and rescue her then go to the manager's office) if you go back the closet on the right of the room will be open crouch inside and use the 'use' key(default E) on a small jack in the box box with ritual writen on it, then it plays an 'up goes the weasel' tune and the jack pops up.
Goodness, it scared the crap out of me, I ran away from it and the guy patroling the hall cought me [img]/forums/images/graemlins/laugh.gif[/img].
It's awesome! [img]/forums/images/graemlins/smile.gif[/img]