Hmmmm. A very profound question. Not sure any of us have an answer! It's a tough life finding yourself in a Grade B movie, and a bad one at that.
I can only offer you these few suggestions:
see the absurdity in it. If you can't see it, look for it
don't dwell on it. You'll make yourself nuts and sick
don't poke about in the toilet. If it looks odd, and it's going down into the sewer, be satisfied! Leave the measuring to when you need curtains or something.