1 The Last Man Alive!

An old man sitting on the top of a mountain Cliff. He can see the entire city from there and suddenly a young boy comes and points the gun towards the man and says in fear " What happened here, who are you?". The old man laughs and says " Well! I thought I was The Last Man Alive but I guess I got some company" and suddenly a large burning building collapsed which scared the hell out of the boy and the boy started sobbing. The boy cocks the gun and says " Tell me what the hell happened here". The old man says "There are no clouds in the sky, There's light but No Sun. All you can see is red flares and smoke". The other guy said " We are probably the last Humans alive and you still want to talk in riddles? Dude tell me what happened! The old man says " Okay! Have a seat, There's a lot to share".