I work with a guy who does that. He recently was telling the tale of how he got a call one night from a couple that had their outlet line completely blocked. Goes over and it was jammed with these special "wipes" the wife uses instead of regular TP. Now, I didn't really understand this part as none of the houses I have lived in had a place to access the septic line other than at the ends but apparently this one does. It is also important to note that the husband had told the wife not to use the plumbing until they told her... So he has the line open and unclogs it. You can see where this is going. Husband: "Stop flushing the F***ing Toilet!" Wife: "But it's fixed?!" Husband: "No it's not F***ing fixed!" As previously mentioned, plumbing can be a shitty job.