#3 – Man of Steel 2 Teaser Trailer
You could say this is the one that started them all. Right after Ben Affleck was cast – before the movie even had a proper title! – this inspired piece of fan work was making the rounds, and got a whole lot of people super-excited about some ultimately unfounded rumors that Bryan Cranston might be signing on to play Lex Luthor. Of course, none of that came to pass, but this trailer makes brilliant use of footage from Breaking Bad, Daredevil, Man of Steel, and more, even stitching together audio to make Affleck speak in character in a role he hadn’t (at the time) even shot a single scene of.