Lily is a shy, wistful girl, a songwriter when no one is listening, and an unpopular cashier at a fast food restaurant who has a crush from afar on Jarrod, a self-assured eccentric geek who works in a video game store. She waits patiently for him each day at lunchtime, hoping he will pick her queue. Jarrod, though, is interested in Jenny, a more conventionally attractive cashier, and always chooses her line.
Lily is fired from her job after her name is drawn from a hat. However, she is invited to finish out the week.
With Jenny not at work one day, Jarrod gives Lily an invitation to his "dress as your favourite animal" party to pass along to her, but Jenny crumples it up and throws it away upon receiving it. Lily retrieves the invitation from the trash, hoping Jarrod won't mind when she shows up with her brother Damon. She also finds that the trash is full of the slips of paper that were drawn from the hat, and that her name is on every one.
The party is sparsely attended with what are apparently teenage and adult customers of Jarrod's store, all dressed extravagantly as their favourite animal. Jarrod is impressed with Lily's shark costume (though he insists an eagle is slightly better) as well as her savant-like video game skills, making it to the finals of a Fight Man video game competition, though she is no match for defending champion, Jarrod (principally because she spends most of their contest staring at him). The two end up in Jarrod's room alone that night and they proceed to have mediocre sex.
Lily now considers Jarrod her boyfriend and hangs out around his store. They set a date one night to see "the new Wolverine movie" at the local Cine-Saurus Rex. Jarrod fails to turn up. He comes by Lily's house later that night to apologize, saying he was depressed and needed to be alone. He later says that he has to kill a Samoan man in his hometown who used to bully him in high school, but laments that he has no car to get there. Lily asks Damon, and he consents to drive Jarrod and Lily to Jarrod's home for the week to meet his fate and complete his fantasy revenge mission with the help of his inept pornography addicted hacker friend and his oddball family.