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Asking the big questions here!!

What I really want to know is what happens to "ghost feces"... Sometimes you know one dropped into the toilet but it is nowhere to be seen...

Typically that's very heavy feces with no gas caused by various bacteria in it, and it slips right down the plumbing without needing to flush.

Yep, if you want to experiment, take a dry toilet (no water) and roll marbles until you get it just right to "halfpipe" its way out the drain.

Water affects this but not much; or you get a rocket-floater that dives down and comes up on the "other side" of the built-in trap.

Rocket floater!

ninja poops

I call them dolphins

If you want to avoid it, get a german toilet[1]. Depending on your opinion on stool inspection, it’s either the best thing ever or the opposite.

Butt vee donn't häff zem anymore! All 'Tiefspüler' nowadays. Can't remember having seen/used the last old one. Has to be 20 Years+, or more like 30.