Passengers on short hour long flights who decide to bring McDonalds/Burger King on board or a huge bag of chips ect. and make the others around them smell what they are eating (egg mcmuffins are the worst!). I understand that the "airlines don't feed you anymore" ..but geez can't these people go one hour without filling themselves up?

Another thing..Passengers who stand/walk slow in the walk lane of the moving walkway..preventing passengers in a hurry from getting by.