The joys of living with a septic tank and an IDIOT

Our toilet upstairs has not worked properly for about 2 weeks. Today we had a man in to empty the septic tank. Deep joy. Still the toilet would not flush. The man then asked for a hammer and chisel. Oh we thought hes lost it and hes going to smash it to bits. But oh no. When Dave (the idiot) tiled the bathroom he found a small hole next to the said toilet. He thought he would fill it with cement. It turns out it was an air vent that made the toilet flush!!! Who would have thought it.