I was working at a company many years ago doing data analytics. I supported a sales team of about 5 Sales Managers, all of which I had great relationships with outside of the office. That month I was especially busy, and this one client kept pestering my friend for some reports, and in return, my friend kept pestering me. Of course, it was my job to get the reports done, but I was buried in work. My friend, the Sales Manager for this client said, "just send me an email telling me when you can get it done". So I sent him a very short yet professional email explaining the situation and the report would be ready next week. At the very end, I hit enter twice and in 72 font bold red letters I wrote "NOW F_CKING BLOW ME, A-HOLE!!!" There was no editing however. It was all written out, plain as day and very visible. About 30 seconds later my buddy looks over and says "Thanks. I forwarded it over to Bob (the client) so he knows when to expect the reports". I chuckled at him and said, "Yah, right". He didn't think twice of my reply and turned away. I sat there petrified and walked up to him and said "you didn't really send that email did you?!?" "Yah", he said, "why?"
My eyes were as big as golf balls. I had him pull up the email, and unfortunately, he didn't actually open the email but simply read it in the VIEW PANEL side window. In that situation, the email looked complete AND professional. I told him to scroll down. With one simple and short roll of the mouse wheel, those big 72 font red letters were screaming right back at him!
I looked at his face and he turned as red as the letters and panicked for about 20 seconds, and then busted out laughing and said, "WE'RE F_CKED!" We immediately went into a private conference room and called the client to explain the situation. He was very understanding, and laughed about it and said he understood. Needless to say, the client got his reports within the hour.