I was flying about a month ago and I borrowed a Macbook to use see if I liked it (I'm used to a Powerbook). I was watching a movie from the HD. After I was done watching I picked up the Macbook to put it away, but as soon as I did that I noticed that something smelled like burning plastic. I ran my hand over the tray table and realized the heat from the Macbook had actually started melting the table. I have read that Macbooks run hot, but that is ridiculous. Was this just a bad Macbook, or are they all that hot?