If we're being honest with ourselves, there's a few things that could go wrong with Mortal Engines. 

There's a lot of factors and variables why the movie could suck. I've put together a list of the possible reasons why:

• The pop corn could be quite expensive
• Someone next to you could fart excessively and often
• It's too loud
• You go blind at its majesty
• You have a heart attack
• You get caught sneaking in MacDonalds
• You have to take your mother in law
• The movie projector stops working
• It rains on the way to the theatre and you get your hair a little wet
• The trailers go on a bit too long
• You eat your expensive pop corn too quickly