Late Night Video Call (Smartphone Scare)

Xiao Yu habitually placed his phone on the charging dock by his bedside before sleeping, activating 'Do Not Disturb' mode. One night at 2:30 AM, his smartwatch suddenly vibrated violently. Groggily, he opened his eyes and saw a 'FaceTime Video Call' from an unknown number displayed on his watch. Normally, notifications wouldn't come through in this mode, but this call had forcefully broken through the system settings. Feeling strange, Xiao Yu reached for his phone on the bedside table. When he pressed a button, the video call connected. The screen was pitch black, making it impossible to see anything, only a faint sound of 'Hoo... hoo...' breathing could be heard.