trigger spark 

An event, issue or person that irritates someone so much that the person explodes in anger and says or does something crazy. trigger, safe space, anger, frustration, provoke, provacative, drama, fight, rage, Hulk rage, mental health, violence, verbal abuse, millennial

The protesters went crazy when the Trump supporters put on those red hats. 'Make America great again' was the trigger spark.

trigger spark by joecoolthefool July 14, 2017