Work that is discovered while original work is in progress and immediately takes
priority over your original intent.
Consequential work involves
significantly more effort/time/resources than the original work required.
So I was painting the kitchen, when a chunk of the wall comes right off in my hand because
hornets had built a nest and chewed right through the
drywall. Luckily, the hornets weren't home, but I'm gonna have to get rid of
the nest and patch the drywall before I can finish painting. Nothin' like consequential work, damn it!