When Mike & I were first dating, we went by my sisters house and she gave me a ring to give to another sister. It was a very pretty gold ring with lots of diamonds. I put it on my hand to make sure I wouldn't lose it in my purse. I forgot about it when we went to meet his family for a graduation dinner. His cousin noticed it and rather than ask me about it, spread it all around that Mike & I were engaged to be married later that year. Apparently, those rumors really grew & grew until a month later when his mom asked me what had happened to my ring. By that point, I had completely forgotten about it until she described it in detail. I laughed and explained that it was my sister's ring and I was holding on to it for a short while. She looked immensely relieved.
It was really stupid seeing as how Mike & I had only been dating for 2 months.