I can't stop being amused by this.
I really didn't like this movie but being a Kevin Smith fan, I would've probably got the DVD at some point to keep my collection complete.
So I was at my local supermarket and I saw Cop Out on sale for £5 and decided on an impulse buy.
But the funny thing was, every Cop Out DVD had a little sticker on it with the phrase, 'For Die Hard fans only'. Either a misunderstanding of the phrase or the most genius piece of marketing.