Frozen - the interactive version

The kids were watching Frozen on the TV this evening, when my son suddenly dashed over to where we keep all the Disney Infinity characters. In our collection are both the Anna and Elsa figures, and it took me a while to work out why my son kept waving them at the TV screen. Eventually I realised what he was doing - each time Anna appeared on screen he held up the Anna figure, and each time Elsa appeared he held up the Elsa figure.

That's a new kind of interactive TV isn't it?