Snowboarder Kelly Murphy happily sang along to Rihanna while filming a selfie video, little did she know she had a follower.
Meanwhile on social media, arguments have developed over the video's authenticity.
Ms Murphy insists it is real, telling the Independent: "Yes the video is real! I didn't know anything was happening at the time but it's so scary to watch it back now! I think I'll stick to the runs with my friends from now on lol."