A client I hadn’t heard from in a few months got in touch with me out of the blue.
Client: Do you have anything to say to me?
Me: …Hello, how are you doing?
It turns out, they thought that I’d been a bit rude when reminding them for my last payment (I’d say I was brisk), and hadn’t been in touch to teach me a lesson.
Unfortunately for them, I’d been full up with clients who paid on time ever since and hadn’t noticed.