Background info: My office line rings to my cell phone.
One evening, I get a call and only notice the last name.
Assuming it was a good friend of mine, I answer: "I'm naked and about to do terrible things to my wife".
The voice on the other end is much deeper than my friends. As he clears his throat I realize my mistake. A big mistake. The voice on the other end asked if he could speak to the owner of the company. While I am my own boss, I was concerned that I may have lost business before I even started.
Luckily, It turned out it was said friends father. I profusely apologized and restarted the conversation in a much more professional manner. He did hire me and continues to do so to this day.
We laugh about it all the time, but I learned a valuable lesson...Always assume that any caller is a business caller.