I was at an academic conference some time ago, sitting with a friend, who commented to me that "I'm tired of hearing Professor X talk on conservatism. Can't they come up with something new?"
A few months ago, about a year after that conference, I happened to sit next to Professor X during a dinner. While we were eating, he remarked to me, "I just recently went to country Y, where they had asked me to present a talk on conservatism. I wish they would ask me to talk on something else, as I'm so tired of talking about conservatism."