Preferably single lines/couplets rather than whole songs, but use your discretion.

Now that I've started this I don't actually know my favourite, but a few that spring to mind anyway:

The Fall - Weather Report 2: "Nobody has ever called me sir in my entire life"

Kanye West - Power: "How 'Ye doin'? I'm surviving / I was drinking earlier, now I'm driving"

Joanna Newsom - Good Intentions Paving Company: "But it can make you feel over and old / Lord, you know it's a shame / When I only want for you to pull over and hold me / 'Til I can't remember my own name"

Swans - Eden Prison: "The supine wild beast upon the slab / Would gladly rip the throat from God if only he could reach up to his white ass."