How Andrew got flour all over his bedroom and by the way, who gets to clean up this mess?

Andrew likes to pretend play with Thomas trains, which includes acting out the videos. If you've seen the videos, you know Thomas gets messy, which Andrew also acts out. Naturally, I followed Andrew when he went into his room with a bag of flour from the kitchen. Let's just say we've done the "pour flour all over Thomas and the train table" dance before. As I entered his room, Andrew scooped an entire fistful of flour from the bag, screamed "snowball!" and threw it at me. He's in physical therapy at school, which I am going to stop, because his aim has gotten really good as evidenced by the direct facial hit I took. Flour is in my eyes, nose and mouth, while Andrew erupts into prolonged giggles. I storm out of the room to get something to clean up when Maddie notices my face. Realizing what just happened, she runs into Andrew's room and commences an all out flour fight with him. Andrew looks like a ghost, Maddie looks like a ghost, the room is in need of serious vacuum therapy and I am so mad at my husband because he took the camera into work yesterday and didn't bring it back. That's the worst of it-I can't get photographic evidence to blackmail the kids when they grow up. Where's the fun in that?