Tentacles! On your head! Sucking out your brain!!!
I have a baby Nyarlathotep - he likes to sit on people's heads (well, mainly Rory's head) and practice sucking out brains. At least, we think that's what he's doing. He needs the practice - quite a lot of the time he just falls off. Especially when he sits on my head. I must have the wrong sort of brain...