In the shower 1

It's early in the morning, I've had an active hour of exercise and activity and am taking a relaxing warm shower to go tackle the day, but somebody, somewhere in the house, flushes a toilet. Ouch! the water is hot! So, I rapidly regulate it and start to relax again, but just for a few seconds. When the toilet tank fills up: swash! a gush of cold water. There goes the relaxing shower, through the drain...