Scenario 1: You we're watching Infinite lists new video, he was hunting for Slenderman (above) when you got to the part where he saw Slenderman in the woods near him you heard a knock on the door. You?

Scenario 2: Make it up

(If you are scared of creepy stuff do not watch the above video, it scared me and my brother so much I had to peek around corners to see if it was safe)