Impossible?

I once took my son to a science fair for preschoolers. One pleasant teacher put a plastic dinosaur into some excessively sticky substance and explained about the La Brea tar pits. "Once anything fell in it couldn't get out!" She held out the jar toward my son so that he could see the truth of her words.

My son braced his little toddler feet. He reached in and pulled that dinosaur out! The woman was amazed.