Crackers going crackers

Crackers, or crackerberries, or bunchberries, are part of the dogwood family. They aren't trees; they lie low on the ground, not much more than 12cm or so high. Cornus canadiensis is how they are most unambiguously known. Elsewhere, they have other names too, like creeping dogwood. But hereabouts they are mostly known as crackers: if you chew too hard on their berries, they'll crack your teeth.