My flatmate has the tendency to take excessively long showers.. I'm not talking about 20 minute or 30 minute showers. I'm talking lengths of upto 45 minutes. Perhaps because she showers so infrequently she thinks it's ok to take showers of this length because her daily average is still within reasonable limits. Other than the fact she is being extremely wasteful with a finite resource, it means that subsequent persons using the shower get only cold water.
Today's reason my flatmate pisses me off;
She takes excessively long showers that use all of the available hot water.