When a pet surprises itself with one of its own farts.

Someone who is possessed by clout chasing. The original human is now gone and a demonic entity that feeds on clout is all that is left. An empty shell with no control of their actions, forced to blindly react to situations they think will bring them attention.

Being startled so suddenly that one farts.

to be startled by a loud fart

To get startled causing an instantaneous fart.

Startled by a fart, so much so that you jump or start at the sound (not the smell)

When you fart in your sleep, jolt as a result and then roll over.