Professor River Song:  You 're doing a very good job acting like you do n't know me . I 'm assuming there 's a reason .
The Doctor: Well , a fairly good _ one _ , actually .
Professor River Song: OK , shall we do diaries then ? Where are we this time ? Ah , going by your face , I 'd say it 's early days for you , yeah ? So , um - crash of the Byzantium . Have we done that yet ?
Professor River Song: Obviously
Professor River Song: ringing no bells . Right , um - oh , picnic at Asgard . Have we done Asgard yet ?
Professor River Song: Obviously
Professor River Song: not . Blimey , very early days , then . Hoo ! Life with a time traveler - never knew it could be * such * hard work . Um ...
Professor River Song: Look
Professor River Song: at you .
Professor River Song: You 're * young*.
The Doctor: I 'm really not , you know .
Professor River Song: No , but you * are*.
Professor River Song: Your eyes . You 're younger than I 've ever seen you .
The Doctor: You 've ... seen me before then ?
Professor River Song: Doctor
Professor River Song: . Please tell me you know who I am .
The Doctor: Who are you ?