Mrs Q : What time did you get up?

Dr Q : At 5.30, Mum!

Mrs Q : Why are you tired ?

Dr Q : Because we went for a long run in the morning !

Mrs Q : Where are we going after lunch ?

Dr Q : To my lab!

Mrs Q : Who are you calling ?

Dr Q : I'm calling Dr Spark. He's my friend.

Mrs Q : When is he visiting?

Dr Q : At four o'clock.