Possible Spoiler but watch out for this one -- In the Dark Brotherhood quest, the Brotherhood Burns, during a pitched and fiery battle, you climb inside a casket. When I did this, everything went dark and quiet. My screen was completely black, not even the little white mist that we're used to seeing during loading screens. No sound at all. I waited for over a minute, then decided I must have experienced my first game freeze. Went to do a hard shutdown when suddenly I hear people on the outside trying to open then casket. Weird. It took forever, but apparently the game didn't actually freeze. So, if this happens to you, give it a few minutes at least.
Anyone else experience this long delay at that point in the game? Is this normal?