I know that this is sacrilege, but bear with me. About fifteen years ago, some friends and I were watching Taxi Driver and it struck me that the entire experience of the film could be changed with one minor edit. The entire feel-good ending could be turned into a daydream and leave people walking out of the theater in a much darker mood.

I don't know, it might be too subtle to even worry about, but just keeping the movie in it's entirety until just before the credits roll, then flash back to Travis on the floor, surrounded by cops falling in and out of consiousness, fade to black, mix in audio of gunshots, roll credits. Therefore making the happy ending (which always seemed a little surreal) no more than a hallucination Travis has just before an unseen final gunfight.

Sorry if my suggestion of tinkering with this incredible movie offends anyone, it's just something that occurred to me.