OK, so I have been playing B-17: The Mighty 8th lately. During the mission I was playing earlier (target was in St. Lo, France), the group was attacked by enemy fighters over the English Channel. A Bf109 was making a run on the formation and I was shooting with the top turret at it. I hit it a couple times (not enough to knock it down) but it was moving so fast, it passed out of my view. But, I heard a large boom! I thought it had collided with another bomber...because I was still flying (so it must not have hit me...right?). So, I went to an outside view, and here is what I saw:
I'm sorry the screenshot didn't turn out all that good...but I thought I would share it anyway. I was somewhat surprised that a Bf109 could do that to my tail. All the other collisions I have ever seen in the game caused the bombed to instantly break up.
It made me laugh so I thought I'd share.

Oh, and when I unpaused it...I saw my crew bailing out. Apparently, it was too much damage.