Well, I consider myself the type that is always on watch for anything,anytime, but I have to admit my own attention lapse. My in-laws live a few blocks away from us, and have a dump station in the front yard, well after a long trip I was very tired and attempted to dump my tanks. All was as normal, pull up, get gloves and all fittings,sewer hose and fresh water hose hooked up to flush tanks after dump. I first dump black, then wedge flush lever down on toilet to refill/flush black tank while simultaneously dumping grey tank.
Normally this works quite well for me, but my father in law got to talking and, you guessed it, all of a sudden i see and hear water running everywhere!! At first I thought fresh water hose came loose, but then I realized black tank was full and overflowing INTO motorhome!!! Thankfully I had already dumped and was just flushing, but none the less I still spent 4 hours vacuuming and shampooing carpets. Note to self....DO NOT ALLOW DISTRACTIONS WHILE ON DUMP DUTY!!! I am comfortable with my silliness and can laugh at myself, so please laugh and learn from my dumb dumb moment:)