This one happened to me yesterday:

I went to a very low cost grocery store. The lines are always very long and they only had one cashier open (another pet peeve). They opened a new line and the woman behind me who had a cart full of groceries, (I had 2 items) about plowed me over to get infront of me.

Pet peeve #1 If someone only has 1 or 2 items, would it kill you to let them go in front of you? Not mandatory, I know, but a nice gesture.

Pet peeve #2 She had a Coach hand bag and paid with food stamps. Hello!? The bag costs $200+, but yet I have to pay for your food? Granted, I carry a Coach bag too, but that's why I shop at low cost stores. I have a Coach habbit to satisfy. After I checked out, I saw her getting into a brand new Cadillac Escalade.