The context of the following conversation is Seeing Robin fully concentrating on his cooking, Kai tiptoed and booed suddenly by Robin's ear thus scaring him.:
Kai says Ha, you should have seen what happened with me and Robin today!.
The friend responds What happened? Didn't you have a lunch date at his place?.
Kai responds Sure did! He cooked a great meal!.
The friend responds I'll bet! He's an awesome cook!.
Kai responds Well, while he was concentrating on measuring an ingredient, I snuck up behind him and yelled "BOO!" He jumped a mile!.
The friend responds Oh, you're such a joker!.