My brother and I were standing outside of a giant green lake. I knew that this was a "sea world" kind of thing, where there were shows and stuff. At any rate, we were standing on a ledge which was perched over this giant pool with green water, and I noticed two people in the far corner of the lake: an old lady in a diving suit and my dad, talking to her. My brother, I guess, fancied himself a performer of some sort, and he was standing at the very edge of our ledge, threatening to jump into the lake at the next exhibit. I could see that he held in his hand several sheets of music, professionally printed, with each bar being two half-note chords, second-inversion ninth chords in C. Each chord was the same chord. I could see seaweed and other things floating around in the lake, and I decided to ask my brother whether jumping in was such a good idea; does he know how deep it is in there?  My brother replied, insolently; "Of course I do! I know what I'm doing!"  So I laughed. The next show was going to be the killer whale show, and when it was announced, my brother hesitated, long enough to see a monstrous black shark-looking thing emerge from the water. The lake had, at some point, changed into an incredible swimming pool, but the water remained green, and everone remained where they were. My brother decided not to jump. He laughed kind of feebly, and said: "Oh, maybe you're right, David." Then he sort of faded away. The next thing I knew, I was in the water. The giant "killer whale" was coming towards me, but I didn't care, because killer whales are reputed to be harmless. I wouldn't drown, anyway, because I was walking on the water. So the giant killer whale careened at me, and I'm not sure what happened next, but at some point I ended up in the water, with the killer whale some distance away. I swam up, up, up, and the water followed me. The old lady in the suit warned me: "you're not going to want to have such a strong reaction to him."  It didn't help, anyway, because soon enough, the killer whale had pinned me against the towering pool wall and was trying earnestly to roll me into a pulp. I woke up feeling spasms in my back which simulated the way I felt in the dream.