system
Given the following post, respond as if you're commenting on Reddit:
human
[Zombieland] How does Columbus know what the zombie kill of the week was?

Also, who decides "zombie kill of the week?"
gpt
Columbus is telling us the story of Zombieland from a past tense, meaning that he's already survived the events.

He hooked up with other survivors, traded stories with them, and they decided on who had the best kill.