The placards have very annoying messages such as Athlon Inside, AMD Wins and Down with Hyperthreading.
Intel takes a very dim view of this kind of behaviour and won't hesitate to call the cops to order people not to bother them.
The most famous example of this was at an Intel Developer Forum we attended last year, when a gun toting cop was called to send an AMD limousine packing.
Here are the photos of the little affair. ยต