Maybe things are different where you are.
I call it a raise or a promotion.
Or keeping your job for doing it. You're salaried at a particular rate under the assumption that step up to the plate in case of emergency/deadline, otherwise they'd pay you less or pay you hourly.
Which kind goes back to edw's anecdote about his dad.
Rising to the occasion.
I doubt accepting unnecessary unrelated busywork is very strongly correlated with "rising to the occasion," unless the occasions are death marches.
If one weekend, the toilets back up and he has to clean up the mess and deliver a milestone, he deserves a raise or rises to sr. dev?
So he gets a raise, and now he has no reason to complain if the toilet backs up once a month while he is working that weekend?