This is a little side project or something.
You were in a train, going to visit your parents. You fell asleep in the train, and woke up when the train slipped the railroad, and fell over. The last thing you remember is the driver, who ran to the hallway and shouted "Something has pushed the train over!" and then everything blacked out. When you woke up again, you found yourself in the middle of a jungle in the middle of the night... The train is stuck in the air, and the sky is full of trash, vehicles, and other things, stuck there, completely moveless...
You have no idea where you are, or what has happened, but you know you see a gun near you, lying there...
EDIT: Put demo link