I had this happen to me a few weeks ago and I though I would share it with everyone. One evening I parked on a steep incline with the front of my car facing downwards. That night it rained pretty hard and the next morning I noticed that I had a leak in my roof. I was able to trace it to the sunroof, but was confused about why it had leaked then and not before. Then I remembered how I was pearched on the side of that hill. My sunroof wind deflector had filled with water and it was more than the seal around the sunroof was designed to handle. There are drains inside of there just in case, but I guess mine got clogged or there was just too much water. Anyways, I don't park on any steep slopes anymore just to make sure nothing like that will happen again. Hopefully none of you will make the same mistake I did.