IF:
ice cubes have a far greater use than making drinks cold...
you try to figure out how you left for the trip with a full 100 gallon water tank and empty 50 gallon black and grey tanks..in a few days the black and grey are full and you still have 30 gallons of water...and it drives ya nuts!!!
the scariest thing you can think of is opening your black tank valve and nothing flows..and you ask the guy behind you to borrow a flashlight and his yard stick...
the second scariest is being parked overnight in a downtown detroit walmart and hearing a sound..any sound..