"I won't say cheese"

I ask all the kids to get their shoes on because we have to run to the store. I'm waiting in the car and Madi is the last one out of the house. When I see her I immediately start laughing and run inside to get my camera. When I get back out she is mad and doesn't understand why I want to take her picture. At which point she tells me, " I won't say cheese", explaining the look in the picture.