Not cruise or Disney related, but I agree that sometimes people are very concrete thinkers. We went through a security checkpoint (unnecessary, it turned out...I missed the sign for the turn we were supposed to take) at Heathrow and were held up for about 8 minutes, just waiting there. Finally someone came over, looked at our stuff, counted us, and laughed, because we had been held up for having 2 3-1-1 bags. Yeah, there were TWO of us. So that was OK. But to the first person, 2 baggies in one bin was not OK.