Well, just be funny. Guys aren't as interested at what happened at the mall with that girl like we are, so just talk about regular things. Unisex funny. Like.. If someone with multiple personalities threatens to kill himself, is it considered a hostage situation? Or you can be dirty funny. Boys always laugh at that.
Always be yourself first. He has to like you for you. If you naturally funny that's a plus because it automatically puts a guy at ease. Men are attracted to outgoing confident women. Who knows, he might like you more than u like him after all this.