The Magic Box was me I think? I posted my lesson idea in the NQT forum a few weeks ago. It got me the job but that was with a year 4 class and they really understood the contradictions in the objects. I dont see why it couldn't be used to enrich language with a Year 1 class but they mightn't 'get it' quite as well as year 4 did. Also, whatever activity you choose, with just 30 minutes I would stick to whiteboard work and shared writing on the board.