The first few weeks that I had Black Ops were when Ascension had recently come out, so I was playing that online a lot. I recall this dude in one of my games who was trolling me in EVERY way possible; He tried to explain the infamous "Box Trick" to me, he trapped me in corners (with the help of a friend of his, of course), and upon getting the Ray Gun from the box, he told me that the gun was a hack inserted into the game by him, and that he would have access to my account information if I picked it up (How could I have known better! The Ray gun isn't a "normal" gun, so it was reasonable at the time to assume it was a hack).
But yeah, the list goes on and on with that guy. He and his friend ended up carrying us to like the mid-teens. Though I can look back now and see that all of the things he said were complete crap, it was sure believable at the time. Now every time I think about the first week of me having Black Ops, I will always remember how oblivious I was to the basic functions of the game mode. That was defiantly my most embarrassing moment, and I didn't even know it at the time!!