The Lovesong of J. Alfred Prufrock by T.S Eliot. You find something new and twisting every time you re-read it. Also, there's a poem the head lady of Governor's School read on our first day there talking about chickens that's really good. I just know it ends "And that's the chicken I want to be" or something.

Also the one about the buzzsaw by Robert Frost is so weird and awesome.