The person below me did something that made the whole floor beneath my feet shake, and besides the sudden vibration which gave me an intense surprise I also felt the beginnings of what is normally felt if an electric current passes through the body (moderately - I don't have any experiences of severe shocks, at any rate), like all of my nerves... instead of anger, as I usually feel, I was just afraid.
Anyone has any idea what this is? I'm going to try to put my feet anywhere but the floor from now on, to lessen the impact... but my goodness, my environment is becoming ever-more hostile
(or my mind is unable to withstand it anymore, more likely).