Got it. I was working at a place that wanted to go 24hr support, but for no good reason. When they came to us (consultants) our account manager said we were going to rotate shifts every week.
I told him where to shove his suggestion.
His obvious retort was to ask what my idea was. I told him to go monthly or longer, otherwise the rotation would chew us up. So we went with a monthly rotation...which lasted up until the buddy of one of the company guys got to first shift. "Chris is taking the first shift permanently, his girlfriend doesn't like the rotation." "Yeah, mine's not too keen on it either. She can suck it up like the rest of us." "It's settled. 2nd and 3rd shift rotate, client's request."