Good One from Biscuit Chucker. Sometimes folks only understand when you get in their face.
I have found that carry-on is not equally enforced, more so in the states. If it looks bulky more often than not it will draw attention, but usually never hit the scales.
I got hammered by VS in LHR as they put my carry-on on the scales. I was flying CO/VS from LAS/JNB. All went well until I was to board in LHR and THEN I got the weigh-in. Not good when your already half through the flight, but nothing changed as I hand carried that which was over and of course you know where it went back too.
Lesson will be not to take so much next time.....or pay for an extra check-in.