Oh dear...
Oh dear. I was just in the second floor bathroom and I came in humming because I had Herbology today and we were re-potting fluxweed (used in polyjuice potion) and this ghost was yelling her head off at me for disturbing her peace and quiet. Then, she went right through me! That felt so weird I got the shivers. I asked around and people told me her name is Moaning Myrtle. Nobody knows why that bathroom is her favourite but I'm staying away from it from now on.