The bystander effect is defined as "what occurs when the presence of others discourages an individual from intervening in an emergency," and it results in a lot of horrible situations where a person is bullied, or left sick and hurt without receiving help from passersby.
While the bystander effect is a serious issue, one that many of us have found ourselves on either side of, not all bystanders freeze in public. There are those who see a stranger in need and jump in to help, consequences or awkwardness be damned.
When I was in High School (about 14) I was cripplingly shy and kept myself to myself, I spent most of my time in the school library to be honest.
One lunch time I was walking across campus when I noticed a huge group of students from all years gathered in a circle around something that I couldn't see - I could hear girls squealing and shrieking and guys daring each other to pick "it" up. I also heard some dickish teenage boys daring each other to squash it or prod it with a stick. I then heard someone near the back of the crowd say it was a disgusting huge frog and they wouldn't touch it if someone paid them.