I was trying to move my ears in front of a mirror, as one does, when all of a sudden I heard "she's practicing on moving her ears" or something along those lines, in French from behind the wall. (Elle se traine à bouger ses oreilles.) I live in an apartment so I can often hearn my heighbours talking, somtimes about me because of the noise, but never like this. What is the scientific explanation for this?