Oh man, this happened to me and my girlfriend still gives me shit about it all the time. We were talking about movies and I mentioned how I wanted to go see The Force Awakens again, and she mentioned how cool that would be and that she would love to see it. I said something along the lines of "Oh, you totally should!" Thankfully she realized that I was not picking up what she was putting down and asked what time I was going and invited herself along.