Haha, I wonder if that was his last thought when he was pulling the trigger. "Shit, didn't I already read that Snape killed Dumbledore?"
At first I was sad that Dumbledore was killed..... but actually I'm relieved, because the current Dumbledore sucks ass.
I'll admit I was peeved when I finished the book in a 9-hour binge and found out SPOILER. I threw the book across the room. Haven't seen a movie since the first one. I'm generally not good with watching movies where I know what it should be like. Started with the Firm, and then Return of the King was the end of it for me.