Lyric discussion by cinnamon_girl 

Cover art for Night Drive lyrics by Jimmy Eat World

Few corrections. I believe it is:

Wine must go right to your head It'd be easy if you get mad

Instead of:

I must go right to your hair It’d be easy if you get that

To aligatoree - What he means by the "three fingers" bit now that you can see the corrections is that if the girl gets mad, she would most likely give him the finger. In in doing so, she would have three fingers pointing back at her (hold up your middle finger and you'll see!)

Excellent song.