What do you do when 35 armed, masked men storm into a restaurant when you're having a relaxing drink?
This Russian video shows a man remaining astoundingly cool and calm while mobsters burst into the building and rush around him, appearing to wave AK-47s, pistols, and cudgels.
They beat up several visitors and knock over chairs, terrifying the patrons of the restaurant in the Western Russian town of Vichuga.
The video, which appears to have been taken on 16 November, went viral thanks to the man's amazing reaction. He doesn't get up from his chair, but instead sits sipping his drink, while his concerned friend rises from his seat.
According to Redditor Personality_Deficit: "Last Sunday 35 masked people entered a nightclub in the city of Vichuga and attacked a table of five people. They were armed with AK-47s, pistols, and cudgels, but mostly just used their fists."
The video was covered on Russian news websites, which report that the incident is still being investigated.
Luckily, no-one was seriously hurt.