Useless facts, the hallmark of any smart guy.
If you don't have a steady stream of useless facts on hand, then you're going to be regurgitating worthless garbage like "did you know that Charlie adn the Waitress from It's Always Sunny are married in real life?" Everyone knows that and everyone's sick of pretending to care about it.
Here's an actual, honest to god, interesting fact that will make your next conversation a blast: The answer to why cartoon characters wear gloves. The answers actually range from the finanical to the practical to the racial, and it's worth hearing about, especially if you like trivia. So check it out.