Crowning Moment of Funny: Sonic Youth can be pretty good comedians when they feel like it, but the Are you gonna liberate us girls from white male corporate oppression? line from "Kool Thing" is a pretty strong contender.
Epic Riff: Plenty - "Death Valley '69", "Expressway to Yr. Skull", "Teen Age Riot", "Silver Rocket", "Kool Thing", "Titanium Exposé", "100%", "Youth Against Fascism"... ah, hell, let's just say "all of their songs" and leave it at that.
Genius Bonus: Most of their lyrics make subtle literary allusions that one is prone to miss if one hasn't read the books in question. Sister, in particular, is loaded with references to Philip K. Dick.
Nightmare Fuel: Some of their early material, especially "Shaking Hell" and "Death Valley '69".
"I Love Her All The Time" gets Bonus Points for the Mind Rape subtext and sudden freak-outs.