Not sure if it's been linked here before, but I just found The Joker's YouTube blog. And I'm in love.
The actor isn't really into it yet in the first two videos, but once he gets to part 3 and part 4 he gets very entertaining. And apparently he's been doing this for a while already.
The whole thing manages to be very respectful towards Heath Ledger. One of the most awesome fan series I've seen on the internet, ever.