Thanks ... I think ...
After catching up with some friends we hadn't seen in a while last week, we spent part of our weekend trawling through boxes of old photos and attempting to put them in some sort of order.
S found a photo a friend had sent me from the botanic gardens in Canada somewhere, with a stone dinosaur in amongst the rose bushes, which led to the following conversation ...
S : Is that a rhinoceros?
K : No ... it's a dinosaur.
S (sounding disbelieving) : A real one ?
K (in tones of "how stupid can you get?") : No of course not ... (pause) ... Mum's not that old !!