Most people in the world are idiots, incapable of thinking of anything other than themselves and the 0.5m of space around them. In addition to what'sbeen described above, the 2 things that wind me up about airports are:-
Why do people decide they need to walk at snails pace as soon as they see perfume or booze with a couple of quid off? This is particularly annoying at 07.00 on a Monday morning in Glasgow.
Why do 75% not notice the signs asking to move the tray to the end when empty, are they blind, stupid or just bloody ignorant!!!