So we're waiting for the bus, watching Bobinogs. It cuts to a scene of a park and the little boy goes on the swing. DS1 likes swings, so starts pointing and saying 'ing' and we have a bit of back and forth ing ing ing.
Then off he runs to the kitchen and comes back carrying a bottle of cordial. I thought he wanted some, - he was pointing at it and shouting, then I realised there was a small (abstract) picture of a swing on there (which if course I'd never noticed before).
Cracks me up every time.