We knew mice were smart, but we didn't know they were THIS smart.

In this adorable video, the mouse owner has clearly trained his pet mouse to ring the bell when he wants to go into his room. There are a pair of tiny bells that he set up next to the door. To show what the mouse can do, the owner set up a camera in front of the door and waited for the mouse to come by.

In this video, the owner closed the door when he knew the mouse was approaching. As soon as the mouse realized he couldn't get through the door to see his owner, he went to the side of the door and rang the little bells. While you might think that it's just a coincidence that the mouse rang the bell, once you see him do it not once or twice but three times, clearly waiting for the door to open after each time, you start to realize that this mouse is really friggin' smart and that the owner has trained his pet house to ask to be let in. It's so cute to watch the mouse try and ring the bells, too. Now if only you could teach cockroaches to do that...