Was hast du denn? (Cf. Was fehlt Ihnen?).
What is the matter with you?
Ich habe es von ihm.
I heard it from him.
Es kräht kein Hahn danach.
Nobody cares a straw about it.
Was ein Häkchen werden will, krümmt sich beizeiten.
As the twig is bent, the tree is inclined.
Die Sache hat einen Haken.
It is not as easy as it looks.