Boris

Boris, otherwise known "Big Black Boots Boris the Bully", is a giant bully who wears big black boots. He used to constantly kick sand in young Dr. Doofenshmirtz's face, especially in places where one would not expect sand. In contrast, the one place Heinz was expecting Boris to kick sand at him was the beach, and even though Boris did not do so, Heinz was unable to enjoy his visit due to continuing to expect it to happen.

When Boris moves to the Tri-State Area across the street from Phineas and Ferb's house, Doofenshmirtz tries to get back at him with a giant sand kicking machine consisting of a huge brown boot and a big bucket of sand, but as usual his plan backfires on him. ("The Flying Fishmonger")