life of pain by black flag. you get to see someone try to attack greg ginn and rollins just beats the shit out of him and then goes right into the song. plus, rollins' voice in this song is just so intense that it fits the music of the song even more than the damaged version. i just wish i found a video of them doing damaged II live. my favorite flag song.
http://youtube.com/watch?v=KjPp9ju7mz4
here's them doing the pre my war version of scream. i like their pre my war versions better. it's a lot of improvisation. greg ginn's guitar sound and dukowski's bass is just fucking amazing in this song.
http://youtube.com/watch?v=l-LZe4RNzQg
edit
i forgot to add damaged I from the same show. you might've seen the part in american hardcore where rollins' starts punching some punker, well it's from this video. another one of flag's very intense moments live. greatest live band ever. i wish i was around then just to see them live.
http://youtube.com/watch?v=z4vhydPLpwo