Through my weekend job at the little specialty fabric and wool shop that catered primarily to tourists, I had met a lady who had a weekend retreat in our area. When in town she would purchase fabric and leave it with me to make up later. I kept her stash box in my home-based sewing room.

At some point, I would receive a photo in the mail with a request to “make this in that yellow fabric… or can you copy this in that glen plaid!?” I would then have her garments ready the next time she visited.
Once time, she had come to my home to pick up a garment as she was heading back to her home in the city. We were talking and catching up as she pulled out her check book and reached for a pen from the jar sitting on the counter which held a random assortment of pens and pencils. It wasn’t until after she was on her way, heading back to her home in the city, that I realized that she had used a disappearing ink marking pen to write the check. (Remember, this was before smart phones and electronic transfer of funds.)
A land-line phone call, a good laugh, and a new check was put in the mail to me the next day!