Have you ever observed greedy behavior in others?

I have observed this type of situation before and not just dealing with food. I've seen people also be greedy with money. The most recent situation I've seen where people be greedy with food was at lunch. There's a little place in the cafeteria where students can buy all kinds of food and drinks and sometimes that line be so long some students decide to skip other. I find that a good example of being greedy. I mean they could just wait their turn just like the others but they decide not to because they're starving or haven't ate in a while at least that's what they make it seem like.