Not one of my experiences thank all fuckdom, but I shudder to think of the tale recounted on another forum, where somebody knew a heavy opioid user, using what I don't know for sure,
H, i think. Poor bastard ended up so badly constipated he had to use an apple/potato peeler/coring knife, to bore a hole through the center of such a semi-fossilized horror, to collapse it inwardly, to allow for its being shat.
That had to be bloody uncomfortable to say the least