Check this little easter egg out from the original BIOSHOCK
http://www.kotaku.com.au/2013/04/this-crazy-bioshock-infinite-easter-e gg-cant-be-real-can-it/
The article is fantastic! Read it or just check out this video, listen specifically, *very closely* at 14 seconds and tell me what you can hear right in the background ;)
http://www.youtube.com/watch?feature=player_embedded&v=qpmvkZ6TIMk