Please continue the story with one sentence.

[ChenPingan]

The last man on earth sat alone in a room. There was a knock on the door....——————————————————《Knock》by American writer Fredric Brown

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[ChenPingan]

He froze in fear, wondering who or what could be outside and if he should open it or not.

 

[AbyssalVirus]

Upon pondering for a while he decided to open the door in high spirits.

 

[Krizzirk]

But just before his hand reach for the knob,...

 

[Enderchuu]

He collapsed on the ground