<human>: Can you succinctly summarize the text in 1-3 sentences?

First of all, I live with my elderly grandparents who are extremely frugal. They cut open toothpaste tubes to get the last bit out, mix water with dish soap to make it last longer, refuse to have any heat in the winter save for a single space heater in the living room, etc. 
They also refuse to flush the toilet more than once a day, claiming that it uses too much water. It's really gross. I tend to get my business done in the morning to avoid having to piss in a used toilet. Last night, however, was different. I'm lactose intolerant but indulged in ice cream anyway, resulting in stomach cramps. I suddenly needed to evacuate my bowels, so off to the toilet I go. Keep in mind the toilet has not been flushed yet today. Anyway, I walk in the bathroom and sit down. Wrong move. The seat was up, which I didn't notice before. So instead of sitting on the toilet, I fall in. I fall into a day's worth of shit and piss. I showered and scrubbed until the water ran cold, but I will never be clean again. ;_;
<bot>: Grandparents are frugal and only flush the toilet once a day. Didn't check to see if the seat was up. Fell into shit and piss.