Hang, Sam Vimes
Reading Snuff for the nth time and had one of those STP revelations we love so much.
Toward the end, the goblin Stinky is saying his farewells to Vimes. It goes like this:
"Hang, Sam Vimes. Hang together or hang separately. Above all, hang on. Hang, Mr. Vimes.
Vimes sighed "I think it's quite likely that I might."
At first this reads like a throwaway line. Just Sam Vimes being Sam Vimes. Had Sybil been there she would have said "Oh, Sam" and swatted him playfully.
But then I got to thinking about the oft-foreshadowed, quite possibly inevitable, conflict between Vimes and Carrot. A very foreseeable result of this conflict would be Carrot executing Sam Vimes, and Sam Vimes voluntarily submitting himself to the law a la Socrates.
It'd be dark, but STP didn't shy away from darkness when he felt it necessary. Imagine Vimes committing some act that was criminal but also the "right" thing to do at the time. Like if something had happened to Sybil or Sam Jr. and the Summoning Dark broke through, just for a moment. You can see Sam finally snapping, but you can also see Sam insisting that he face justice for snapping. Or perhaps Sam takes out Vetinari (it runs in the family), who has finally taken realpolitik too far, and then King Carrot is on the throne . . .
You could even see Sam Vimes insisting that Carrot execute him, as the law requires. Sam would force Carrot to issue the verdict. Carrot would have tears in his eyes, but he'd do the just thing and send Sam to Mr. Trooper's warm embrace.
Obviously I have no idea if this was where STP was going with the Vimes & Carrot dynamic. But I think this rings true as a possibility and Vimes' "it's quite likely I might [hang]" was more than a throwaway line. It was foreshadowing.