Minecraft wiki entry for Things_not_to_do, associated text: If the player drops too many items at a time, by activating a lot of dispensers and droppers or by destroying a lot of chests full of items, or even by rapidly destroying a large number of tall kelp at their bases, then a large number of items could add lag to the world. Enough lag makes the game harder to play and may even crash the game. On Multiplayer servers, the player may get kicked for crashing the server.