What is your pet peeve?

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We all have them. That thing that drives you up a wall. But are they universal? Mine is standing in line behind a woman with an overflowing cart in the 10 item or less row. Is there someone in a far away land standing behind a woman like mine wanting to shout "Didn't anybody teach you to count?" So what is yours. I wonder how many I will see myself in. Just as I am sure someone reading this is the woman with the overflowing cart.