I always go out of my way to complement women on their watches and jewelry if it is something I like (big, silver, cuff or bangle....). The results have always been very good - they always seem happy that someone noticed and said something.
I'm in on this one too - I love it when a woman wears a watch that is a little too big and it slides up and own and clangs into things as she moves. Another really cool aspect of this is when a woman wears bangles and then do the same thing.
I'll have to agree with the previous post - I'm NUTS about women wearing large and sloppy loose steel watches that slide around on the arm and always end up face-down, etc ... Wow!!