Some nice worksheets to study oxymorons. It's a great way to develop / build vocabulary. Download and get links to great Quizlet vocab sets for oxymorons too.
In one activity attached, students cut up and try to put the first half with the second half, to make the oxymoron.
Read the Oxymoron related books to present these common English oxymorons.
There were two morons on a bridge. One fell off. Why didn't the other?
-- because he was a little more on.