What's so tasty about shoes, rocks and keys

Over the past month Leo has gone crazy for keys, shoes and rocks. All of which he likes best when in his mouth. And he loves the chase that ensues when his parents rush to fetch the rock locked behind his teeth or to pull the sole from his tongue. While this grosses us out immensely, the giggles and sweet devilish looks on Leo's face during these exchanges are priceless.