In desperation, the big bosses hired a junior programmer, Mac, whose job was to find the notes, write the required code, and insert it into the program in place of the notes. Mac never ran the programs—they weren’t done yet, of course, so he couldn’t. But even if they had been completed, Mac wouldn’t have known what inputs to feed them. So he just wrote his code based on the contents of the notes and sent it back to the original programmer.

The programmers noticed, however, that the more precisely they wrote their notes, the more likely it was that Mac would send back correct code. One day, one of the programmers, having a hard time describing in words the code he wanted, included in one of his notes a Lisp program that would generate the code he wanted. That was fine by Mac; he just ran the program and sent the result to the compiler.

This technique caught on so quickly that within a few days, most programs contained dozens of notes defining functions that were only used by code in other notes. To make it easy for Mac to pick out the notes containing only definitions that didn’t require any immediate response, the programmers tagged them with the standard preface: “Definition for Mac, Read Only.” This—as the programmers were still quite lazy—was quickly shortened to “DEF. MAC. R/O” and then “DEFMACRO.”

Several months later the programmers realized nobody had seen Mac for quite some time. When they went to his office, they found a thin layer of dust over everything, a desk littered with travel brochures for various tropical locations, and the computer off. But the compiler still worked—how could it be? It turned out Mac had made one last change to the compiler: instead of e-mailing notes to Mac, the compiler now saved the functions defined by DEFMACRO notes and ran them when called for by the other notes. The programmers decided there was no reason to tell the big bosses Mac wasn’t coming to the office anymore. So to this day, Mac draws a salary and from time to time sends the programmers a postcard from one tropical locale or another.