"What this one about?"

Here's a guessing game. What is David (2 1/2 years old) talking about when he says, "What this one about?" A book? A movie? Nope!

Here's a hint - the answer is something like sour apple, root beer, watermelon, etc.

He's asking about ... a sucker! When he gets a sucker from the bank, he asks, "What this one about?" Translation = "What flavor is this?" ;-)