I've heard a number of vidders say that the bridge is the hardest part to vid, and some even take it out of the song. But when I get a vid idea, the bridge is almost always the clearest part of my vision. It's a moment of transition, it connects whatever I'm trying to say in the introduction to the end. It often builds toward a climactic moment in the song. It's great for capturing change -- in the characters, in their relationships, in the story. And it's gloriously free of any random awkward lyric that doesn't work and you hope people ignore. It's almost always the thing that gets me excited to make a vid, and it's almost always the part where I see the clip choice most clearly when I'm first starting.
I'm interested if other vidders find this to be the case.
(Also, three posts in one day! I think this is a personal record.)