Speaking of 'No's,
Nilp and I are trying to collect many possible ways of saying 'No.' Needless to say, most of these come from the LotR movies. Gandalf and Frodo seem to love the word too much.
I remember one night I was goofing off with a friend in the middle of a driveway
in our school campus when a vehicle passed by. We cried 'Noooooo!' to each other in this really Frodo-in-Moria-ish way thinking one of us might get hit by the car. That was fun.
On a more serious note, I've always liked how the phrase 'looks foul but feels fair' applies to a great many things. But in contrast, it's sad that it seems more things 'look fair but feel foul.'