Strange Things.... is it the time of the year??

Two strange incidents occur to me, they caused me to instinctively think of the supernatural but yet, it does not frighten me. I'm sure there's some logical explanations for it....maybe someone reading this can tell me about it.... hee...

First Incident:
My lab door is made up of two chunky piece of wood with standard rectangular windows for us to peer in or out of them. So its always clear if someone is standing outside the door trying to come in or just hanging around.
The door has a hydralic system to "soften" the closing and opening of it, like most doors, also, it has a plastic roller that sticks out to cushion the door closing effects also. Hence, ALOT of noise when the doors are being opened, as it closes and when its slightly a-jar.

here's the mechanisms:


when its opened, here's how the plastic roller will be:


Today, my labmate and I witness a really strange incident with the door, it has NEVER happened before today (at least not to my knowledge).

The door went ajar by itself, without anyone on either side of it! for a good 3secs! It bang close and then it opened AGAIN! for another 3 seconds! For the second time, both our eyes were feasted on the self-opened door.....



She said she felt scared.....

Wat could it be??

Second Incident:
As you may know, my car is old and the tuner died on me and Ad bought me a new replacement

Yesterday, on my way home, I heard some interesting noises that came from it. It sounded like someone used their fingernails to scratch at the speakers like this:



I thought i was hearing things, so I tried listening for it again and again and again, it only happens when I'm near home and near work!!

Initially the noise was heard when the radio was turned on, but when I turned it off also HAVE!
then I noticed a trend with the noise..... whenever I go over a hump the noise is specially LOUD!

Wat do you think it could be??