Some of us remember the movie 'demolition man', and some of the memorable quotes in it, such as 'take this job and shovel it' and 'lets go blow this guy'.
When wrongly quoting a saying is funny, well...its funny.
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But when a DUmmy gets a quote wrong, well...its more like popcorn without salt or butter.
That brings us to the billboard in question:

DUmmies can't seem to get anything right.