Easy FFXIII for me. The moment it opens up, it does so with a bang. You'll enter that wide green field and see those giant tortoises in the distance. Turns out you can even fight them! Then it turns out you can be dust in half a second. That moment was just awesome. Probably made even better by the incessant railroading before.
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.