<human>: Last night when I was at work (as a server), I was helping out one of my coworkers by bringing food to a party she was serving of thirty 13-14 year olds. When I was trying to figure out who ordered a particular item, this kid snapped his finger at me and told me it was his. I told him (in a stern voice): "Do not snap."  He looked at me shocked as though no one had ever told him anything and he apologized.

That leads me to this, when have people done something unexpected that has rattled you and left you with little hope for humanity?

Summarize the given text in a few sentences.
<bot>: A 13 year old snapped (with his finger, not verbally) at me and I responded accordingly. What shocks you?