OK, I'm posting this video just for fun, but really, it's kinda neat. A guy over at YouTube, named TheArcaneWiz, created a bunch of videos that are the "audio tapes" you could hear when you unlocked a character on the BATMAN: ARKHAM CITY Video Game.
Here is one of my personal favorites, Mister Freeze. he also posted many more of the other villains as well. Give this one a quick listen. Like I said, they're sorta fun to listen to! Enjoy.