Ear Worm: Like any good musical soundtrack, there's plenty.
Ho Yay: The scene before and during "When I Was On Top Of You". Lampshaded by Humphrey's perfectly timed "Fudge, Packer?" The DVD Commentary points out Swan smiling, nodding, and going out of frame near Packer's crotch when Packer starts singing.
Moral Event Horizon: Bell crosses this first when he shoots Swan, and again when he kills everyone else except Packer "in self-defense".
Tear Jerker: "When I Was On Top Of You" and Packer looking sadly at his horse before running off.
The Woobie: George Noon when he realizes he will die a virgin.
"You know Packer, because of you I will never get laid!"