Sorry if this is in the wrong section!

My Son has randomly started saying "Scary Roof...." and at certain times of the day won't walk into certain parts of the house. This includes walking from his Cot out of his room, he just screams and hides behind his change table until I tell him it's ok and he Mummy will come and get him.

It started happening around 2 weeks ago, and usually this type of behaviour (if attention seeking) will last 1 week max, It just seems really bizarre?

I also noticed that a toy we have will randomly go off without bumping it or anything. It happened in the middle of the night the other week and scared the beejezus out of me. This doesn't bother me as it's such and odd occurance but the "Scary Roof" thing has me a bit puzzled?