I work at a small IT consultancy, providing support of various kinds for startups and other small companies. Our focus is on planning and thoughtful recommendations, rather than being reactive. We work with dozens of companies, and our weeks are generally scheduled out a week or more in advance.
One day a client with about 40 employees sent an email at 5 PM:
Client: Hi! Sorry for the short notice, but we’re moving our office from the 3rd floor to the 5th floor tomorrow. Can someone come onsite at 9 AM?
We don’t work with that client anymore.