HE: (In an unpredictable high pitch) You know those 20ps that cost £50?
ME: (In a reassuring low tone) No. What do you mean?
HE: Those 20ps that because they've got no date on them people buy them for £50
ME: Oh right?
HE: Yeah, I had one and sold it for £250 on ebay!
ME: No way! Where did you get that from?
HE: I just found it on the floor.
ME: No way! What are you going to spend the money on?
HE: A pogo stick and an electric motorbike.
ME: Great buys!
HE: (In a reassuring high pitch) Bye.
ME: (In an unpredictable low tone) Bye!