You Speak Window?

My family and I were wandering through the neighborhood strip mall when a kid, banging on the window from inside a store, seemed to be speaking to us. The boy was clearly telling us something important, and we stopped and tried to make it out. I couldn’t hear a word he was saying nor could I read what he was saying by his lip movements. I asked my wife if she could understand the kid. She said she doesn’t speak Window.