Word Power
oxymoron 
Oxymoron is defined in dictionaries as a rhetorical figure in which incongruous or contradictory terms are combined, as in a deafening silence and a mournful optimist. J. A. Cuddon in his monumental work on Literary Theory describes oxymoron as an old but common device in 
literature especially in poetry, closely related to antithesis and paradox. Among the examples of oxymoron cited by him are given in the article,
which you can read by clicking here.:

Here is list of few oxymoron posted in different discussion groups on Internet.
 

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First Exercise
Win Prizes
Oxymoron in literature
Paradox
Act naturally
Found missing
Resident alien
Advanced BASIC
Genuine imitation
Airline Food
Good grief
Same difference
Almost exactly
Government organization
Sanitary landfill
Alone together
Legally drunk
Silent scream
British fashion
Living dead
Small crowd
Lonely crowd
Lonely company
Business ethics
Soft rock
Butt Head
Silly wisdom
 Military Intelligence
Software documentation
New York culture
New classic
Sweet sorrow
Childproof
"Now, then..."
Synthetic natural gas
Christian Scientists
Passive aggression
Taped live
Clearly misunderstood
Peace force
Extinct Life
Temporary tax increase
Computer jock
Plastic glasses
Terribly pleased
Terribly easy
Computer security
Political science
Tight slacks
Definite maybe
Pretty ugly
Twelve-ounce pound cake
 Diet ice cream
Rap music
Working vacation
Exact estimate
Religious tolerance
Entertaining boredom