While instinctively fast-scanning my poop for irregularities during the button up/turn/flush move, I suddenly brain farted the following; Is it likely that at this moment another human produced a turd shaped exactly the same as mine? As in both of us not noticing it if somehow our stool would be magically swapped. Color/shape wise a perfect copy.
To get a rough idea I did a quick calculation; 7 billion souls who on average defecate once a day. 2 billion do so in a way that the result is a viewable deposit of shit. 'This moment' I quantify by a minute (I know, I've read it too...) With 3600 minutes in a day dividing 2.000.000 bowel movements, makes 555 'same moment dumps'.
While staring into the bowl I decided the number of different types of turds (consistency, color, texture, etc) in reality must border on the infinite. Therefore the chance of this event actually happening could be infinitely small. It's a lose/lose endeavor.

I do believe however that it's a certainty that someone else has had the exact same thought about identical turds. Many small room thinkers have preceded me and many others will follow. Also, I estimate the possibility of me having this idea simultaneous with someone else as greater than the identical poop option. So if forced to bet my life I'd bet on the latter. Just to clarify that.