Treato found 16 discussions about Cold Symptoms and Cats Allergy on the web.
Best Answer: When the toilet is flushed, the toilet is robbing pressure from the shower, which is usually close to the toilet. As the COLD water pressure goes down from the toilet flush, the HOT water pressure is higher, therefore the water gets hotter as the COLD pressure goes down.
The shower can be a nice place to spend some time alone, relaxing under a warm spray of water and getting clean with nice smelling soaps and shampoos until someone flushes the toilet. If you hear screams form the shower when you flush a toilet in your house, it is probably because the water suddenly got very hot or cold.