See the Lego Batman Movie

The Lego Batman movie is way, way better than it needs to be. Hanging off two solid franchises (the clue's in the name) it could confidently expect to make a fortune just by showing up. At least for one episode at least. 

However, it is very, very, good. Just the right balance of action, story and knowing self-reference to keep everyone happy. I don't think I've laughed out loud at a film so many times for a while.

Very strongly recommended.