Bad Religion- Turn On the Light: The part after the little bass solo when the backing vocals kick in: "And I'll buuuuuuuuuuuurn like a roman fucking candle!..."
Sleater-Kinney- One Song For You: When Corin starts screaming "Leave little boy crumbs you can follow back when you get lost becoming a man!" over and over.
Sleater-Kinney- Light Rail Coyote: The end when they're all singing "Old dirty river, come let me in"
Sleater-Kinney- Sympathy: The bridge where most of the instruments drop out and Corin just lets loose in this amazing bluesy voice.
Iron Maiden- NOTB: The riff after the solos. That riff practically changed my life.
I could probably go on forever with these. I'll think of more later.
"COLONEL KLINK, WHY HAVE YOU FORSAKEN ME?!"