A Christmas Easter Egg in iPhoto?

GodotJr writes "Early Christmas morning I downloaded some digital pictures into iPhoto on OS X 10.2.3. My trusty iBook began playing what sounded like a repeating Irish jig. I thought I had accidentally started iTunes, but no, only iPhoto was running. The 'jig' continued until I quit the application at which point a childs voice said something I didn't quite catch (!) and then a choir belted out 'Hallelujah!', once, and was silent. A restart of iPhoto did not get me an encore performance. Has anyone else experienced this?"