My first lucid dream happened in 07. I was in the science building of my old school, and my biology teacher was there. He was possibly the wisest person I had ever known up until then. All of a sudden, I realised that it was meant to be my summer vacation. I went to do a reality check to see if I was dreaming, and got the answer that I was. I shot behind him and strangled him with either my hand or a cable of some sort. I then dived into a vortex that was further back into the building. At that point the dream lost coherence and I lost lucidity.
This actually happened at a time when I'd just discovered lucid dreaming and I was using intention-manifestation in all the wrong ways to try and induce a lucid dream. Well, I was 17 and my head was filled with the idealistic crap of how things should be from TV and the movies