The scene in Batman: Arkham Asylum when it seems as if the game glitches up and breaks. It was my friends game and I freaked out! I thought I had broken his game!
The craziest though had nothing to do with the game. I was playing Fallout 3 and suddenly a message appears from some random guy on Xbox Live. I check the message and it is basically random noises with a white noise background. I tried to get in contact with the guy, but my messages fell on deaf ears. He never sent anything back to me.
Come one week later, and I am at my friends house and I remember the message and think it had been a while and they will admit to the joke. I ask my friend to look up the guys name and it says no such name exists. I think,"Oh, we must have put in the wrong name or something." I pull out my hardrive and plug it in. I sign into Live and go to my messages. The message had been deleted. I didn't delete it. And there were older messages, so the 360 didn't just delete it on its own.
Sorry for the long message, just thought it might freak you out as much as it did me.