I dreamed that my house was connected underground to my next door neighbors?!?

your neighbor is probably a representation of you, at some point in your life. The man with the gun is probably some great challenge that will (or has) greatly changed your life. The underground page is possibly your mind going back to that life changing event. The urine and rat poop, imagination probably. Its all representation. Just think back to a moment in your life where everything changed. Your mind is recalling p events