Lol let us know if you find out what the noise was :-D
The subject is called "Analysis of the genocidal social practices"... the translation would be something along those lines. It's very interesting! One of the best subjects I've studied.
I found out the source of the noise, and it wasn't Esteban (you're very stealthy). It was my mum. She got up to turn out a light. It was the obvious answer, which makes me feel relieved and stupid at the same time. But I can live with that.
So Esteban, it was you that stole my biscuits? I think I've been a bit unfair to my little brother then...