My students lose it at the end of the day / last 10 minutes this year when it's time to clean up and pack up. It's like every rule and procedure they've learned goes out the window. I've tried patience and praise, I've tried being the "mean teacher". Nothing seems to make a difference. They are a good group the rest of the day and it's like they've used up all of their self control by that time. They are loud with no volume control, they talk during directions and won't stop talking when I speak, they leave their seats... Yesterday I had two students chasing each other in the back of the classroom and I yelled at the group and said tomorrow (today) we'd be majorly reviewing dismissal procedures. Honestly, though, I don't know how to "fix" this. Does anyone have suggestions?