You indeed made a unique superhero movie which makes people think "The Dark Knight" needs to lighten up.

你们的确拍了一部与众不同的超级英雄电影，它让人们认为《黑暗骑士》需要明亮一点。

He should lighten up a little.

他应该放轻松一点。

Lighten up: You can have fun!

你会得到乐趣的。

Lighten up! I was just joking.

放松一点，我只是在开玩笑。

It was only a joke. Lighten up.

这只是开玩笑，别那么紧张好不好。