A clogged drain pipe can block the water from a shower stall and also from a toilet because the water from the shower stall and from the toilet does eventually flow through the same pipe. The water will not quickly flow down the drain if an obstruction is blocking the water inside the pipe. The drain for a shower stall can be clogged by hair and soap residue. A toilet can be clogged by an accumulation of dry and hard residue inside the pipe.