Imagining the feeling I would get when finishing in no way compared to the actual feeling.
I'm a fairly emotional person. I will cry watching a sports championship; the visit from family on Day 35 of Survivor leaves me bawling and clutching a blanket; a text-video of my friends' daughter taking her first steps got me good - you get the idea. I was a wreck when I crossed the finish line at Disney - the video (taken by MarathonFoto) is not pleasant to watch. :)
That being said, I'm getting emotional doing research for the London Marathon. And I'm craving that feeling at the finish line.