I'm self-titled in that department.
There are so many songs I love and come back to and fixate on for awhile. Lost Souls, Midnight Sun, A Single Second, Anxious, Ether, Sacrilege, The Last Kiss, Totalimmortal, A Winter's Tale, Lower It. In no particular order.
But when I think about how I really feel about Afi, and how their music makes me feel about myself, Sacrifice Theory every time.