A Stunning Upset

It's surprising to us when a chess giant (such as boris spassky) falls in a mere 12 moves. But it happened in this game. Spassky commits an oversight that allows Korchnoi to create a nice tactics display.

so what do you guys think? are short defeats of chess giants uncommon? or is it simply a part of life?

EDIT: yeah, i know spassky was only 11. Calm down, guys. I'm not perfect :)