When Daddy is left in charge...

So Joel claims the bottle was actually nearly empty when Dean got ahold of it and that he only had one swig, with most of that ending up on his shirt. If that's true, I want to know why Dean was literally running after the cat from one end of the living room to the other, laughing deliriously, for about 20 minutes when I was TRYING to get him to go to bed tonight 30 minutes past his regular bedtime!?!?