These could be inaccurate...

I feel like maybe there was a scene on Benson in which a bathroom is not available for some reason and B. torments Clayton by talking about the sound of rushing water until C. flees???

MAYBE?

"A veteran is hired to retile the bathroom, but happens to disappear. Benson now has to investigate what happened."

~ http://www.tv.com/shows/benson/parade-rest-31721/

And maybe there was one in All Creatures Great and Small where Tristan runs from the breakfast table because they are talking about some gross topic and he's so nauseated.

Well that's not the scene.

"Tristan is charged with examining a consignment of sheep bound for Russia..."

~ https://www.radiotimes.com/tv-programme/e/csy4j/all-creatures-great-and-small--s4-e2-barks-and-bites/

It is very hard to confirm these memories.

These shows are not popular enough.