Oxymoron Cafe

Didn't know what to make of this. Cafe and restaurant aren't an oxymoron, are they? Maybe the food inside and the words cafe and restaurant are the oxymoron. Or, maybe the owner is a word buff. Which put me in mind of an Economist column on a recent, random, "best word" contest that someone had on the internet. I thought it was all funny. The column is at: http://www.economist.com/blogs/johnson/2012/09/words.
And if you were wondering, the winner of the best word in the English language was "diphthong".