A typical Miranda advisement goes something like this...

"You have the right to remain silent.  Anything you say can and will be used against you in a court of law."  Perhaps this gentleman's case will cause the advisement to include a singing advisement.  He was arrested for suspicion of driving under the influence.  After protesting the way the arresting DUI officer handled him, be broke out into an a capella version of Bohemian Rhapsody.

When DUI attorneys are evaluating a case to present to a jury, they must consider everything from blood or breath alcohol tests, the training of the DUI officers, performance on roadside sobriety tests, as well as certain intangilbles.  Singing a full version of a Queen song, even mostly on key, while entertaining to a jury, will likely suggest significantly lowered inhibitions that were the result of a large quantity of alcohol ingestion.