Probably not BU to be fair.
During an outpatients visit today to a large city hospital I went to use the facilities only to be greeted by a large steaming pile of shit on the floor next to the toilet.
Obviously backed out disgusted and reported it to the nearest staff member. Have spent most of the day trying to bleach my brain (unsuccessfully) but every so often the rational side of me has tried to come up with a reasonable argument for why someone might do this. This has also been unsuccessful.
Even if there does turn out to be a good reason, why wouldn’t you report it? The staff member was horrified and scuttled off so I think I was the first to raise it.