Seems we hit on a hot topic.
I made mention of this in another thread recently.
I've seen people attempt to break the rules often at the gate before boarding a plane. I am gratified and thankful when I see an airline rep enforce their rules ("You will have to check that bag, it is too large", "No, we are not boarding your zone yet, please step aside"). Almost as annoying as someone who asks you to change seats with them because of their lack of planning.
We all know that air travel is not a lot of fun anymore but it is more tolerable (and there are fewer stampedes)when basic rules are followed.