Scissors! Family members borrow them and they disappear. Friends borrow them and they disappear. Pets borrow them and they disappear. They just seem to disappear into thin air.
The real reason I have so many scissors is because when I am quilting on my longarm I need to clip a lot of threads. I choose a color that does NOT match the quilt, so that when I set them down I can see them. Then they do NOT disappear!
Happy Friday the 13th, it's a lucky day!