- The "Bolero Effect" section, with Vivian Stanshall announcing and Oldfield adding one instrument after another over a strange undulating riff, and ending with the glorious "Plus...TUBULAR BELLS!" '*KLAAAAANNNNGG*'
- How about the fact that Mike was just 19 years old when he recorded it?
Awesome / Tubular Bells
All of it really, but especially: