7. Fallout 3
https://www.youtube.com/watch?v=zPt08UYmyMo Teaser trailers don't get much more iconic and memorable than this, as with Bethesda's taking over of the Fallout franchise from Black Isle Studios, they obviously wanted to make an impression. You know a developer has faith in a fanbase and in their resulting property when they can show genuine restraint in how its revealed - and so here we got a very slow zoom-out away from a broken radio, as the fact we're in a post-apocalyptic wasteland settled in. Ending on the final reveal of the Power Armoured-up Brotherhood of Steel soldier was just enough to let the rabid fans of the previous two titles do backflips, with the rest of us catching up rather quickly afterwards.