http://i.dailymail.co.uk/i/pix/2008/12/13/article-0-02688B4C000005DC-244_224x423.jpg
I'd have to put Joe Calzaghe at the top of the list. The way he crouches then sticks his head into his opponents chest, then does like 6 windmill light punch/slap type hits is just funky looking.
Calzaghe has an arkward style, but its not the strangest ive seen. In fact, i think Froch has an even stranger style. He is slow on foot, but he has boxing ability and can actually be a good counter puncher and can fight backing up ( as seen in the Pascal fight).