Similar in effect to the spiritual cleansing or rebirth of denominations which practice Water Baptism, Sidewalk Baptisms differ in that they are spontaneous, involuntary, and predicated by violence.
A Sidewalk Baptism occurs when one, who was once flippantly hostile, becomes humble and de-escalatory upon receiving a demoralizing or defeating blow.
You will recognize a Sidewalk Baptism by the subject's sudden desire to be cleansed of their sins, be reborn, or otherwise gain the acceptance of the community.
"Start behaving yourself before you earn a sidewalk baptism."