Oxymoron!

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The rhetorical term oxymoron, made up of two Greek words meaning
"sharp" and "dull," is itself oxymoronic.

As you probably remember from school, an oxymoron is a compressed
paradox: a figure of speech in which seemingly contradictory terms
appear side by side. British writer Thomas Gibbons characterized the
figure as "sense in the masquerade of folly."

The oxymoron has also been called "the show-off" figure, one that
gives voice to life's inherent conflicts and incongruities.

"The true beauty of oxymorons," says Richard Watson Todd, "is that,
unless we sit back and really think, we happily accept them as normal
English." Todd illustrates his point in the following passage:

It was an open secret that the company had used a paid volunteer to
test the plastic glasses. Although they were made using liquid gas
technology and were an original copy that looked almost exactly like a
more expensive brand, the volunteer thought that they were pretty ugly
and that it would be simply impossible for the general public to
accept them. On hearing this feedback, the company board was clearly
confused and there was a deafening silence. This was a minor crisis
and the only choice was to drop the product line.
(Much Ado About English. Nicholas Brealey Publishing, 2006)

Source : http://grammar.about.com/od/rhetoricstyle/a/100-Awfully-Good-Examples-Of-Oxymorons.htm