A Wiley’s Dictionary entry from the comic strip B.C.:
humidifier - an Italian oxymoron.
I don’t see how this is an oxymoron. It’s food-fast. ?
Ouch.
Disagree. A party can be “Republican”. That just means it’s stiff and boring and over by 9p.m. 
I see “civil” has already got a work out, but
Civil Engineer
Engineers, of course, were the original nerds: tact
The Hospitality industry.
That’s not an oxymoron. Buttermilk is the stuff left over after churning and taking the butterfat out. Redundant, maybe, but not contradictory.
Living dead.
One can have a purely visual alarm that is silent. “Alarm” means to alert, not necessarily with noise.
Okay, what about “Progressive Conservative”
Please explain
Spoken in a stereotypical Italian accent (think of Mario and Luigi), it would sound like “humid-a fire.” Of course a humid fire is an oxymoron.