I accept many redundant expressions without realizing their redundancy. Here are some:
Unsolved Mystery – A mystery solved is not a mystery.
Old Antique – Are there new antiques?
Added Bonus – Isn’t a bonus an added feature?
End Result – Which came first, the end or the result?
PIN Number – Personal Identification Number Number.
General Public – Does public need a general?
Actual Fact – Is a fact a fact if it isn’t actual?
Free Gift – Is it a gift if it costs money?
Past History – Is there history that isn’t past?
I could go on and on and continue, and go on and on some more and continue.
Besides finding redundancy lists online, Richard Kallan has a book of redundancies titled, Armed Gunmen, True Facts, and Other Ridiculous Nonsense: A Compiled Compendium of Repetitive Redundancies.
Did I mention how I accept many redundant expressions without realizing their redundancy?