Baggage
It seems to me that waiting at the baggage carousel is one occasion which brings out the very worst of people. Everyone wants their own little bit of space, which has one end adjacent to the carousel, and then extends outwards, ending in their own baggage trolley. Of course, there is not enough space around the carousel for each of the hundreds of (probably exhausted) people just off the plane to fit, so the situation is unstable.
While I was waiting for my luggage yesterday, I ended up standing behind a woman who had positioned herself in the above situation. Due to the fact that I hadn't read the hand-luggage rules that apply to flights leaving UK airports, I had had to check in three bags. Each time one arrived, I had to move the trolley out of the way, ask the woman to move so I could pick up the bag, and then retreat out of the way so the pushier passengers could continue standing right next to the carousel watching everyone else's bags go by.