I once started a food fight in a high school cafeteria. All it took was a Hunt's Snack Pack chocolate pudding cup and a plastic spoon. I used the spoon as a catapult to launch a dollop of the pudding toward the general direction of whoever was sitting at the whichever table I aimed the dollop toward. Then I recall sneaking away as the volleys of counterattacks and counter-counterattacks flew back and forth and lunch ladies intervened and classmates were rounded up for violations of the student conduct code.
And long after I walk away from this place, I'd like to think maybe I helped start or at least helped fuel some of the conflict between the left and the right and better yet between the right and the even further right.
Only in a heated disagreement do most people say what they really think. Make that happen on purpose and then listen and learn.