had this conversation with a child at work yesterday:
bob*: why didn't we do show and tell after group time? are we doing it after lunch?
me: do you remember what [the teacher] said at group time today?
(she said we'd probably do it before we eat)
me: what did she say?
bob: she said that today is the first day of spring
me: um, yeah but what did she say about the show and tell?
bob: look-- its my darth vader ship. its flying
i gave up on the conversation at that point. lego made into star wars stuff was obviously much more important than his question about show and tell