Today, I was lecturing about Medieval cities in Europe for my world history class, and all of a sudden I got tongue tied and instead of saying "medieval cities," I said "the importance of medieval titties." I said, "did I say what a thought I said?" A slightly older female student who sits right in front of me laughed. I then said, "they were important, but that's not what this lecture is about." It actually turned out to be a nice lecture.