My DS doesn't play make believe either Cod - I am sure it is a 'boy' thing .... DD pretends all the time ....
DS was playing with a little girl who was playing 'shops'. She said, "Hello sir, lovely day out there isn't it?"
He said, after looking out of the window, "No, it is raining!"
She then tried to play 'kitchens' with him ... she picked up a rubber pretend chicken and said, "Now, how will we cook this? Shall we roast it?"
He looked at her as if she was mad and said, "It isn't REAL! We can't cook it, it'll melt!"
My friend (little girl's mum) and I were wetting ourselves