What did I just say?

Sometimes I sound like a broken record. Here's something I've been telling the kids a lot this week:
"What did I just say?"
For example, on Tuesday at the bus stop, I had a student walk away towards an area he was not supposed to be in. I told him to stop and wait. He turned around, looked at me, and kept walking (deliberate defiance is my biggest pet peeve). I quickly caught up with him, got in his face and asked: "What did I just say?"
Yesterday I explained a worksheet to a small group I was working with. The directions were simple. I even gave them an example. As soon as I gave them the paper, one darling student raised his hand and asked me what he was supposed to do... "WHAT DID I JUST SAY??"
Today as my students were walking "in line" toward the cafeteria, I told them to stay away from the puddles. Not ten seconds later, three kids jumped in a huge one. I glared at them: "What did I just SAY?"
I could go on and on, but I think you get the picture. Man, it's like these kids are deaf or something...