YouTube channel "TheFineBros" is known for its parody videos, but it also has another claim to fame: the "React" videos. Sometimes it's older adults reacting to the latest fad in pop culture. Sometimes it's teenagers reacting to world news. And sometimes, it's kids.

Because kids reacting to anything and everything is always funny. It's a rule.

The latest addition to TheFineBros' is "Kids React to Avengers: Age of Ultron Trailer," and the results are exactly what you'd expect. The kids appear to be elementary school age, but be warned that one of them utters some NSFW language.

What's most surprising is how their reactions largely mirror those of adults seeing the trailer for the first time. "What is this?" "I have no idea what this is." "Oooh, it's creepy." "Whoa...!" And so on.

You can find loads more React videos starring these adorable kids over on YouTube.