Probably "Mrs. Potato Head" or "Training Wheels". "Mrs. Potato Head" because it was the hardest song to write and it took me a while to finish it and feel good about the lyrical content. But I've had that idea in my head for so long, especially the visuals - pulling apart a Mrs. Potato face and how that doubled as a meaning for plastic surgery. "Training Wheels" because it's the only love song on the album.