not meddle in the affairs of...

Do not meddle in the affairs of wizards, for they are subtle and quick to anger.

-- J.R.R. Tolkien

Do not meddle in the affairs of Unix , for it is subtle and quick to core dump.

Do not meddle in the affairs of cats, for they are subtle and will piss on your computer.

Do not meddle in the affairs of Vorlons , for they are angry and too quickly subtle.

Do not meddle in the affairs of dragons, for you are crunchy and taste good with ketchup.

Do not meddle in the affairs of bards , for they are unsubtle, and your name scans to Greensleeves .