['All of the people at my office have decided to quit all at once.', 'Oh no! Did you quit too?', "No, I'm staying put, they've been with me through a lot and have really helped me out."]
Well that's very loyal of you. I'm sure your boss will appreciate it. Maybe you'll get a promotion!
All of the people at my office have decided to leave all at once.  I'm one of the only few that are staying.