Benjy's latest game

Just had to post about a thing Benjy does which I think is pretty clever. We sometimes leave the last word off sentences, as you do, for Benjy to finish. One is, 'Are you Mummy's best...' - the answer being, 'boy'. Recently, he's started looking at me with a very mischievous look and instead of saying 'boy', saying something else entirely. Often it's something within sight - can be anything from a telephone to the garden to the fridge - but very often it's something entirely in his imagination. He thinks it's hysterical. This can go on for up to perhaps twenty alternative answers before he gets bored and just says 'boy'. This is just one example of when he likes to play this game. Others are when I ask him what his name is (recent answers include 'Chuggington' and 'Mummy'), and in fact anything where I leave off the last word of a very easy question ('Who's that - Grandma...'; answer - 'Microwave'). I love how it shows me his imagination and sense of humour.