1) The Dreamers
So what if Theo and Isabelle go full Lannister? This film is actually quite beautiful and it's one of my favorites. Saying they have a unique twin bond is kind of an understatement.
2) The Prestige
The twins here may come as a shock at first, but you have to admire their dedication. That finger scene..
3) Avengers: Age of Ultron
Okay, so I had some major problems with Ultron, but I kind of love it on principle just because of the Twins. Wanda and Pietro were two characters I anticipated the most. It's a shame Whedon fucked it up in the end. Hopefully the new directors retcon him. (Yes, I'm hoping for a retcon) I'm buying the DVD just so I can watch the alternate ending where he lives.
Bonus: It Takes Two - Come on, I had to throw one Olsen Twin movie in here, and it was between this or Billboard Dad. I got one of these because of Billboard Dad: