Big headbutt

It took a long, bloody week to subdue the Snakebites under Grudbolg, and Ghazghkull was forced to decapitate the scarred old monster twice before finally winning his loyalty. When challenged to a headbutting contest by the hulking Goff champion, Ugrak, Ghazghkull was like a piledriver, sinking his foe a full foot into the ground and knocking him unconscious.

WAAAGH! Ghazghkull: A Codex Orks Supplement