Mad cat?

The year has started well... not. One of the cats has gone mad. I blame it on the new year's fireworks. Since yesterday morning Paulchen has been sitting in the hall, staring up the wall and howling like a wolf. Either he is seeing things I cannot see or he is has gone mad. I am quite sure he is not ill or in pain, so I have decided to ignore him. If I pay too much attention, he may just feel encouraged to continue, right? It got a little better during the day. He takes breaks from howling to eat and sleep. Fingers crossed he will get bored with it completely, soon. Otherwise I will be going mad.