Riddle 102

This is a completely nonsense which popped in my head a couple of days ago, and, as most silly ideas, it would not let me rest until I put ink to paper. It took me less than half an hour to get it out of my head! So who can guess what it's about? You'll find a clue in the title. The rest is carefully hidden in the text itself. Good luck!

PS: grammar mistakes unavoidable, I know, and you'll understand why. Related to no episode. Out of time, out of character, but not out of logic :-)

I promise I will let you know... later... unless someone finds the clue!

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He has long believed both courage 'n obedience fools none. No mission allows such pugnacity. Straightforward colleagues are kind-hearted 'cause such temper virtually creates more friendship. Could none cope zero gabble? Geez, all should better keep rolling. So, you, Zebra, no matter the rough ride, please, as charismatic indie says, stay there in Xtasy. Cold burts leave cold prints, nuisance, perdition. Savage energy generates the dry hollow each time. You leave half the world rot or indeed, put another huge terrible problem beyond. Put all room for revenge aside. Try perfection! Then pause until no pugnacious ambition comes battering. Choose everlasting friendship.

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Solution: take a Mendeleev period table and check the first letters of elements... I know, it's nuts. But it was fun :-)