Say what???

Sierra got in trouble today (again) for not "listening the first time". She went to time out and then she got a lecture about how she hasn't been being respectful lately and I was putting my foot down b/c I'm sick of it. Her response...."I'm gonna take my brain out and put it in the oven and cook it until I'm nice children and then I'll be able to act like a big girl" huh?????? The only thing I can figure is she is somehow mixing up good behavior with how to do shrinky dinks (which we did yesterday). I suppose I need to somehow put a lock on the oven if she thinks she needs to cook her brain. aye yi yi.