AM I BACK IN SUMMER CAMP AGAIN?

I don't get it, why is it when you are in the shower and someone flushes a toilet anywhere in the house, you get scorched in the shower? Until recently I thought this only occurred in camp! I can remember this one kid we all hated and as soon as he would get in the shower, bam we would go flush all 4 toilets in the bunk, and everytime he would scream out in agony from the pain of the hot water, man we were cruel at that young age, anyway ... I have lived all over the country and this never happened until Denver, what is so different here? Am I back in camp again?