Well, how to reply humorously when you come?

You can reply: "OK, I'll wait for you. You have to hurry. I'm afraid I can't wait to go first. " Or "ok, I'll wait for you, but you have to hurry, I'm afraid I'm stuck in the same place and can't wait for you." This reply can express your sense of humor and relaxed tone, making the other party feel relaxed and happy.