BEGIN.
// Here might be dragons
.
.
 IF...
 // Beware of the Jabberwocky
 .//user the force, luke
 .
 .
 ENDIF.
.
END.

    /* Mark: If there's one thing you learn from this code, it is this...
   Never, ever fly Air France.  Their customer service is absolutely
   the worst.  I've never heard the words "That's not my problem" as 
   many times as I have from their staff -- It should, without doubt
   be their corporate motto if it isn't already.  Don't bother giving 
   them business because you're just a pain in their side and they
   will be sure to let you know the first time you speak to them.

   If you ever want to make me happy just tell me that you, too, will
   never fly Air France again either (in spite of their excellent
   cuisine). 

   Update by oej: The merger with KLM has transferred this
   behaviour to KLM as well. 
   Don't bother giving them business either...

   Only if you want to travel randomly without luggage, you
   might pick either of them.
   */

// fix for groupid > 9 
// if groupid ever gets to 100 everything will break (again)

if (groupid < 10) {
groupid = "0" + groupid;
}

else
{
    //error situation
}

下面是一个必须声明的局部变量，只是为了将一个常量传递给库函数:

// This only exists because Scott doesn't know how to use const correctly

在20世纪80年代早期的某个时候，我们在PL/I中为公用事业编写财务建模代码。接到一个客户的电话，说代码在评论之后就爆炸了

/* Honest this works */

这家伙用了我们的标准金融方程花了大约15页的代数把一堆代码组合成一个方程。在三里岛事件后，当公用事业公司不得不以巨大的代价注销他们的核电站时，这个方程失败了，因为FIXED BIN 15(整数)溢出，如果代数没有发生，就不会发生这种溢出。