While watching the Lion King with my older toddler (almost 3), he asked me an interesting question I couldn't answer. During the scene with Scar and the hyenas, I asked him if it was scary (as I was concerned it might be). He said yes, and asked me "Why is it scary?". Further questioning made it clear that he did think it was scary, but he didn't understand why, and I didn't come up with a good way to explain why something would be scary.
How do you explain what "scary" is to a toddler or preschooler? Not so much concerned with how to deal with being scared, that I seem to understand - but I feel like he needs to know what "scary" really means.