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The following is an extract from Hidden Imperial Histories by Adept Voliusnius Brouyt
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Of the many Space Marine Chapters that protect the good citizens of the Imperium none are as well respected, nor as admired the warriors of the Ultramarines. Such is the greatness of their deeds their stories are told on innumerable worlds, their reputation as the saviours of the Imperium of Man is both well deserved and proven, time and time again. Indeed such is their martial prowess that even other Astartes can only but compare themselves forlornly inferior to those that hold Guilliman's geneseed.
This however occasionally leads to friction amongst some of the more bellicose chapters of Astartes that still stubbornly refuse to yeild to the wisdom of the blessed Codex Astartes. Such antagonism is best summed up with an anecdote from when the Ultramarines encounter with an obscure and ill-recorded chapter whom records merely identify as the [Angry??] Marines.
This chapter had apparently chased a tyranid splinter fleet into Ultramarine space. Impressed by their sheer ferocity the blessed Calgar offered an invitation to their Chapter Master, a man known to history only as Tempustus Maximus. However the invitation to meet their spiritual liege was responded to only with the head of hive tyrant on which was crudely scrawled an insulting cartoon of the Ultramarines 1st Company's defence of Macragge and images of male genitalia.
Infuriated by such a blatant and insulting Snub, Calgar personaly took it to on himself to demand an apology from the arrogant Tempustus Maximus, travelling to the offender's battlebarge's throneroom in person. Unfortunately he little expected the animalistic rage that would greet his justified demand for obeisance from the vile lesser chapter's Master and the argument between the two soon came to blows.
Sadly the clash between the two occurred behind closed doors, with no clue exactly what words were exchanged. Yet when the doors opened again it was Calgar that was bloodied and bruised, with the sacred Gauntlets of Ultramar torn from his shoulders. Only the wise counsel of the Inquisition prevented him declaring immediate war against his unruly brethren, a war that would no doubt have cost the Imperium greatly before the Ultramarines inevitable victory. The story stands as a clear example of how refusal to follow the Codex only promotes discord and strife between erstwhile brothers.
As to what occurred in the Angry Marine chambers, few can know, the only clue perhaps the jeering cry raised by the Angry Marines whenever they meet Ultramarines during campaigns. A nonsensical mantra of "STOP HITTING YOURSELF STOP HITTING YOURSELF", repeated ad infinitum. What such an idiotic phrase could mean a scholar can only guess at, perhaps it is merely an indication of the less than exemplary mental nature of non-codex Astartes.
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http://1d4chan.org/wiki/Who_Watches_Them