Without sounding too much like a street magician: think of a video game helicopter. Any video game helicopter. Don't tell me what it is for now, just keep it in your mind. If it didn't crash, then the chances are it was used to spoon-feed you a few plot points before the action started.
These two noble activities - exploding and expounding - are pretty much the only reasons video game helicopters exist, as far as I'm aware. I made a video to explain this strange phenomenon, so click the video below for a load of downed helos and puffed-up storytelling. Any good video game choppers I missed off the list? Let me know in the comments.