Reasonable doubt
A lawyer is losing his case and his client is facing almost certain death for murder one even though there is no corpse.  In a last ditch effort to save his client’s butt, the lawyer tells the jury that the alleged victim is in fact alive and about to enter the courtroom.  The jury looks at the back door and the lawyer seizes upon the opportunity to tell the jury about reasonable doubt and how they cannot convict if they have it (which they obviously did since they looked!). 

The jury convicts anyway and the lawyer gets feedback from them afterward.  He asks one of the jurors how they could convict when they all looked at the back door to the courtroom.

The juror replies “yeah, we looked, but your client didn’t”.