thank you, i realised we had two seven year old piggies and didn't know what popcorning was!It's called popcorn because the piggy will suddenly jump around like a piece of corn popping. It's really cute to watch, have a search on YouTube for a video, it's really funny.
I love it when my boys do it, and when they zoom around their cage. One of them was running around at top speed yesterday and the other was following with a look on his face like he didn't know why he was running, but he was. Then they both collapsed on their sides in the hay pile for a rest.