A: Let's play cards. B: I don't know any card games. A: I'll teach you one. B: Okay. What will you teach me? A: It's called poker. B: Is it easy to learn? A: Yes, it will only take about 30 minutes. B: Okay. Teach me how to play. A: We each get five cards. B: Oh, look. I have four tens. A: That's great, but you're not supposed to tell me. B: Oh. Sorry. Okay, I don't have four tens.