Same here. Gaining anything at all at the expense of someone else ultimately hurts everyone. In a situation like the one you have mentioned, I agree with simply sticking to the facts: "Yes, the boxes are to be broken down and that is what I do"...and then just keep right on working without being concerned about why the boss had come to you with a reminder applicable to everyone. If the boss then says something like "Well, that is not what I have heard", simply say you will be sure to double-check even the smallest ones the next time you dump boxes. Overall, just agree with everything you possibly can and then confirm your awareness of what is expected without ever explaining or defending yourself unless specifically asked...and while also never pointing fingers or blame toward others unless answering specific questions in front of a judge.