'Star Wars' Fan Arrested for Threatening Friend Who Spoiled Movie

12/22/2015 10:19 AM PST

A teenage 'Star Wars' fan is in jail after threatening to shoot a friend who spoiled the plot.

Cops say 18-year-old Arthur Charles Roy became enraged after a Facebook friend revealed plot points.

Authorities say Roy, who lives in Helena, Montana, sent his friend a photo of himself, with a gun ... threatening to go to the friend's school and shoot him.

The incident occurred Thursday and the school was on lockdown Friday. Roy was arrested later that day.