The chillies can reach up to 2,200,000 on the Scoville scale, making it the hottest in the world.
The caption of the video says: "The first few chews were very hot but just about manageable. Then the volcano erupted."
While he's glugging down milk, the boy's grandad can be heard in the background saying: "You're not supposed to swallow it!"
He came back on the video post to give a few words of wisdom for anyone else considering taking on the challenge: