Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: About a week or two ago I was walking into the grocery store. The grocery store parking is about as you would expect. Each entrance/exit has a crosswalk with stop signs on either side.  
  
As I walked up to the crosswalk the person on my left was stopped at the stop sign letting traffic through and a car on my right was just coming up to the stop sign. I entered the crosswalk and the car on my right was suddenly right ontop of me. They grazed me with their mirror so in retaliation, I popped their car with knuckle.   
  
When I say pop I don't mean punch, kick, knee, or any kind of meaningful force. A single knuckle flick to the car strong enough to make a thump and get her (the driver's) attention but nothing more than that.  
  
AITA for thumping her car in retaliation?  
  
For those wondering how this ended, she screamed "What the fuck?" and got out of the car to yell at me for hitting her car. When she threatened to call the cops I begged her to so I could watch her explain how she ran a stop sign and struck a pedestrian in a marked crosswalk in broad daylight. That was enough to shut her up and send her on her way.

thumping a car that nearly hit me