[mothballed]

If you flush the toilet at precisely the moment after you take a shit, the vacuum force of the toilet venting down the waste line will pretty much keep that from happening. That's basically prison rules.

[stavros]

Where is this magical prison where nobody farts?

[nake89]

They flush the toilet every time they fart, of course.

[pests]

That is called a courtesy flush and it does happen.