I was making a custom village, with a bell, to make the village count. Well, a wandering reader spawned right beside my bell, and he of course ran into the bell, and for some reason, the bell is rung so much as he runs into it, the sounds can't process right, and the ani.action can't either and it over clocks the game and crashes it. This has ruined the world I worked hard in to make, and I can no longer open it. This bug works a lot like how the villagers sleeping crashed the game. The world crashes and ultimately decides not to let you back in.