"A capfull of oxymoron in a bucket of water, and you're ready to clean anything!"
Actually, oxy from the Greek for sharp...moron from the Greek for dull. The word oxymoron is itself an oxymoron. Similar to a contradiction in terms.
Such as: Jumbo Shrimp, Military Intelligence, Silent Scream, Living Dead, Same Difference, Peace Force, Working Vacation, Microsoft Works. Or a few of my favorites: A Good Job, A Caring Boss, Bad Luck, Honest Politics, Tax Break, Legal Loophole, Customer Service Ethics.
One cannot delve into the word oxymoron without uncovering so many references to cynicism, sarcasm, nihilism, paradox, juxtaposition, or rhetoric (just to name a few). I just described myself in terms!
Oxymorons, like rationalizations...you can't live a day without them.