worst dream i've ever had

about one year ago, i had a dream, which was lucid but i, however, couldn't control it. in the dream i was sitting in my classroom and my german teacher was explaining something on the board when suddenly, it started raining blood and organs from the ceiling and the lights became completely tinted in red. since this was a lucid dream, and  therefore felt like it was real, you can probably imagine how terryfing that was. i remember how my hands were shaking as i slowly covered my face with them and i kept telling myself: "wake up, wake up, please wake up" while crying. suddenly, all the blood, organs and body parts dissapeared and i looked up, completely terrified. i expected everything to be completely normal again, but in the front of the classroom, where the blackboard should've been, there were these caroussel horses and circus music was quietly playing. though all that just happened, all the other people were sitting in their seats like nothing was out of the ordinary.