What gives you chills?

Obviously I'm on a theme here, but not everyone gets the chills from the same things. For me it's "Nessun Dorma," "Ave Maria," "O Holy Night," and "The Dance." Doesn't matter how many times I've heard those songs, I get chills every damned time I hear them. I'm sure there are a few more that I can't think of at this moment... What is your list?