How not to handle an oral argument
Don't tell the judge she's a few fries short of a happy meal.
[via the Volokh Conspiracy, where the comments suggest that, taken in context, the attorney was trying to say "there are additional steps here that you have to take" rather than "you're a moron." All the same, good reason to avoid a phrase that could be construed as an insult, esp. if you're from out of town.]