My cat is a sadistic, frostbitten beast of the night. She loves catching mice and birds, then torturing them to death - this process usually takes at least one hour.
I often get the idea my cat sees ghosts or something. Whenever all the doors in the house are open, she runs up to the attic as fast as she can, to stay there for a minute while meowing, then runs down like crazy, and this goes on for hours.