The text plays on the phrase 'professional courtesy,' which typically means professionals showing respect to one another. In this context, it humorously implies that sharks, as predators, show courtesy to lawyers, insinuating that lawyers are akin to sharks in their professional behavior. This relies on the stereotype of lawyers being predatory or aggressive, akin to sharks, and the humorous twist that even sharks respect that.
Sharks don ' t eat lawyers . Professional courtesy .