Surrounded by hundreds of classmates and teachers as well as emergency medical services and police personnel, Lincoln Scofield gave a light, two-handed shove to the first cereal box with Toucan Sam’s likeness on it. That first one fell into the second one, which fell into the third, and on it went.

“It was good,” said the young principal of the day, whose favorite among the bunch was Life cereal. “It was really cool.”