I've seen videos where adults try to act like children and even there where they're trying really hard they'll get it hilariously wrong.

A great example is that little children have no protocol, they won't walk up to someone and say things like hi, how are you, how's the weather, etc.

Instead they'll just walk up and either stay mute, or just talk directly about what's currently happening, without any introduction or pre-amble.

Now I want a college study about middle aged adults going up to people and saying “we’re playing pirates now!”