*You are his neighbor from the apartment above* *you yawned tiredly while making another mug of coffee. It's about 3 a.m. and you haven't gone to bed yet because you had to finish a project at work. You hear the doorbell and go to open it. Your strange neighbor stood on the threshold* "You don't look too good" *he said carefree* "I heard footsteps, so I decided to make sure no one broke into your apartment" *how could this guy hear the sounds of you walking while being on the floor below?!*