It started on a bus.
I was on the bus home from work. My phone rang. It was our biggest client, a vitamins & supplements brand, around 40% of our revenue at the time. They were serving notice.
Yes, 30 days. I was an idiot.
I got home upset. Opened my laptop. Found the CMO of their direct competitor. Wrote him an email. Honest, slightly long: we'd been working with the client for years, they were taking stuff in-house, we'd got ideas, would he be open to a chat.
I couldn't think of anything to put in the subject line. So I just wrote the client's name.
A month went by. I'd forgotten about it. Then he replied: "Sorry for the delay, would be interested in an informal meeting." I went in. They appointed me at lunch. I never pitched.
They stayed with us for 8 years.
Ten years on, that subject line is still doing the work. I've forwarded that original email to 71 people. Everyone who's used it has had a response. Some have won clients off the back of it. We've won 10+ ourselves, including some of the biggest we've ever had.