Today I was helping my very special gentleman friend of five months to winterize his RV. He thought his tanks were completely empty, but he pulled the valves out just in case. Well, when he pulled the black tank valve out.... um....... well........ apparently...... there was some very THICK "leftovers" still in his tank. It was liquid enough to spill out, but it was still..... THICK. He thinks he knows how and why those "leftovers" were there, that's not my point.
My point is......... You cannot ever say that you INTIMATELY know someone until you have had the wonderful "bonding" experience of inadvertently observing the contents of their BLACK TANK!