Macros

Hey Lispers, CL newbie here. I know you're itching to scar my mind permanently, so I'm here to give you a chance in doing so! Come up with one of the most obfuscated Lisp macros ever, but keep it efficient. Of course, I'll have no idea how to gauge macro efficiency (trollface.jpg), but I'll leave that task to /prog/. Winner makes me quit Lisp forever.

^Good _Luck!