This video is beyond an explanation, but try to listen to it for longer than a minute. There's quite a lot of effort put into it.
I've been scouring the internet for clips of Knightfall the radio play, but with nothing to show for it. I remember the play being extremely long and violent, and totally absorbing, it was broadcast on Radio 1 in 1994 on the Mark Goodier show in short 3 minute slots, produced, adapted and directed by quirk master Dirk Maggs (his website). It was quite instrumental in making me a Batman reader, a highlight being Kerry Shale doing a fantastically camp and violent Joker. Fansite here.