To cut a long story short, I decided to see who the actor plays a security guard in The Longest Yard. It's William Fitchner. I realise he's also the bank manager in The Dark Knight. I Google more and then this Yahoo question theory pops up, and it makes A LOT of good sense:
-"His leg gets messed up and only the leg and see how the Riddler uses a cane
-The joker says "whatever doesn't kill only makes you....stranger" he gases him then and that may be a hint that the banker may become strange like the Riddler.
-An off the ball hint is the green surrounding the banker. Such as his eys, the gas, and the piece of paper on the floor behind his head.
Alot of attention was paid to a minor character so I think that he has got to be The Riddler."
http://answers.yahoo.com/question/index?qid=20080805233518AAljeMN
Its a very strong theory, and I like it. What do you think?
-"His leg gets messed up and only the leg and see how the Riddler uses a cane
-The joker says "whatever doesn't kill only makes you....stranger" he gases him then and that may be a hint that the banker may become strange like the Riddler.
-An off the ball hint is the green surrounding the banker. Such as his eys, the gas, and the piece of paper on the floor behind his head.
Alot of attention was paid to a minor character so I think that he has got to be The Riddler."
http://answers.yahoo.com/question/index?qid=20080805233518AAljeMN

Its a very strong theory, and I like it. What do you think?