Creepy!

So odd things have been happening at my house lately. I wouldn't give much credit to my experience because I am just a chicken and probably watch too much "Ghost Hunters". Mike, on the other hand, does not get scared easily and he is not quick to blame things on the paranormal. When we had first moved into our house we did some major remodeling and updating. Anyways He had an incident where his Farting toy kept going off when no one was near. And also the closet in our guest room would be open every time we went in there, but we both were annoyed with each other thinking each other to be the ones opening it. We just brushed those little incidents off thinking we are just in a new house and just trying to get use to all quirks of the house.
One thing I do think is that we have a ghost cat in the house. I have seen cat out of the corner of my eye and have even felt something brush up against my leg like a cat does... when there is nothing there. One day I was folding laundry in our room. Molly was standing in the doorway of the bedroom and I watched her head move like she was watching something (about eye level with her) walk from one end of the hall, past her, and down to the other end. She didn't growl or anything... just watched all interested.
Anyways...I wouldn't let myself think the house is haunted and I still don't know that it is. I do think the cat is here (The past owner had a beloved cat die which is probably buried in the back yard), but that doesn't scare me nor warrant this house being haunted.
So last night I woke up to Mike looking out the bedroom window. i asked that was going on and he said he had woken up and heard three distinct knocks coming from the Game room (The room next to ours). He said it sounded like someone knocking on the window. He didn't see anyone outside though and was too lazy to go look in that room. I had forgotten about that incident until I woke up and heard banging around in our Guest room. I am too much of a chicken to investigate and Mike wasn't home. So i just avoided that room until Mike came home. Nothing looks amiss in either rooms (The guest room nor game room). So I dunno... Like I said before... Mike does not believe the house is haunted and is very critical of ghosts and noises.. but he heard something last night and we don't know what it was. Kinda Creepy....