This blog post shows you what Vista is really thinking as it boots. Hilarious. Here's a snippet.
Starting up… I’m still tired as heck here, so don’t even think about keeping me up too long.
Hmm… you want me to work? Don’t think so. Let’s have some fun.
Wrong password. He, he. Just kidding. You typed the right one three times.
Phoning home to Redmond…