Funny face

I have a new facial expression, my surprised/excited/shocked face! I do it A LOT!! If I hear a loud truck go down the street, see someone I like, hear someone come in the door & yell for me, well just about anything makes me do it! Here's a video of an example of how it happens, a loud truck went down the road & I heard it & reacted to it. Mommy asks me if I heard the loud truck & I do it again! Everyone thinks I'm so funny!! What do you think??