A year or so ago I would exploit the innocence of my boy and say, "Show us yer nuts!" and he would put on a crazy act. This fell out of use for obvious reasons. However recently Kirk and I saw the latest muppet movie and noted how much Skye resembles them when she runs. So now our cue for "do silly stuff" is "RUN LIKE A MUPPET". Gales of laughter guaranteed.