I'd imagine something like a guest bathroom that is rarely used so the bacteria have time to multiply and diffuse up the water pipe. Or develop a biofilm on the pipe walls that isn't removed by running water (to see this effect leave a dish of water out for a few days so it feels slimy then try to rinse it with water)

I don't think this is likely at all, but I could understand how it could come about in some niche situations.

You can have pressure loss in the while system and it can suck water up it and contaminate a lot of fresh water.

Douching master race. Moved and my bidet no longer has the necessary pressure for douching and I'm back to being the guy from OP's meme. Don't know about inserting anything anywhere tho, the right amount of water pressure, maybe with the right angles, and you're good to go.

Even then, I see no way for water to go back up the bidet line and contaminate stuff elsewhere. Its like expecting faucets to contaminate things upstream when you wash your hands, it kinda makes no sense, at least to me.

I get called unc on the regular for exactly this kinda shit I swear😭

2 sheets of toilet paper.

Too little.

It's hard to miss

Yes, but it happens

It doesn't, it's still in the bowl.

It does

It's easier than it might seem.

I've been using this for a while, but then I realized that it wasn't convenient for me and I stopped pooping altogether