Them are the fun calls. I had a vacant house call where no one was in the house for two weeks during a deep freeze, the owner went over to show the house, the front door would not open. He had to go through the garage. Same thing first floor ceilings all collapsed, hardwood floors where all buckled, upstairs carpeting had 2 to 3 inches of water standing on top. Turned out last time the home was shown some one flipped the switch on the thermostat to A/C The water run down the registers of the furnace and burned out the electronics. My bill was the cheapest in his overall repairs. I just had to fix about 6 burst pipes.