Oldie but a goodie!

[idk01]

After experiencing difficulties with his computer, a poor, incognisant user
called the system maker's technical support line for assistance ...

Tech: Hello. How can I help you today?
Cust: There's smoke coming from the power supply on my computer.

Tech: Looks like you need a new power supply.
Cust: No, I don't! I just need to change the startup files.

Tech: Sir, what you described is a faulty power supply. You need to replace it.

Cust: No way! Someone told me that I just had to change the system startup
files to fix the problem! All I need is for you to tell me the right
command.

For the next ten minutes, in spite of the technician's efforts to explain
the problem and its solution, the customer adamantly insisted that he was
right. So, in frustration, the technician responded:

Tech: I'm sorry. We don't normally tell our customers this, but there's an
undocumented DOS command that will fix the problem.

Cust: I knew it!

Tech: Just add the line "LOAD NOSMOKE.COM" at the end of the CONFIG.SYS
file and everything should work fine. Let me know how it goes.

About ten minutes later, the technician received a call back from the
customer ...

Cust: It didn't work. The power supply is still smoking.
Tech: Well, what version of DOS are you using?

Cust: MS-DOS 6.22 ...
Tech: Well, that's your problem. That version of DOS doesn't include
NOSMOKE. You'll need to contact Microsoft and ask them for a patch.
Let me know how it all works out.

When nearly an hour had passed, the phone rang again...

Cust: I need a new power supply.
Tech: How did you come to that conclusion?

Cust: Well, I called Microsoft and told the technician what you said, and
he started asking me questions about the make of the power supply.
Tech: What did he tell you?

Cust: He said my power supply isn't compatible with NO SMOKE...