[The Knocker]

It seems you accidentally installed a mod while playing Minecraft. It's called The Knocker. Now you have a personal stalker you can befriend. At first, he doesn't like to show himself and is almost always silent, but you can get him to talk... HEY, KNOCKER, STOP EATING WINDOWS! Yeah... If you see him circling in the water ("I'M A FISH, I'M A FISH, I'M A FISH"), or running as fast as he can to your house to knock on the open door, or jumping on your carpet, don't be surprised - that's your idiot Knocker. Although, even though he likes to leave you without glass and get in the way ("IT'S IN THE FUCKING BOX"), he is useful - he can bring you food or something else useful. Well, good luck, or something... kick him if he starts eating windows.