"but threads just stop on their own."
Oh yeah? When's this one gonna end? More whimsical and pointless than a Seinfield re-run and its still got legs.
One day it will just.... stop.
The sad thing is nobody will ever know, not even the one who got the coveted "last post".
Or the RKBA could appropriate it for Undead Thread III and keep it going for months. :-)
There are no thread killers only thread generators.