A guy rings tech support to report that his computer is faulty.

Tech	:	What's the problem?
User	:	There is smoke coming out of the power supply.
Tech	:	You'll need a new power supply.
User	:	No I don't! I just need to change the startup files.
Tech	:	Sir, the power supply is faulty. You'll need to replace it.
User	:	No way! Someone told me that I just needed to change the startup and it will fix the problem! All I need is for you to tell me the command.
...10 minutes later, the user is still adamant that he is right. The tech is frustrated and fed up...
Tech	:	Sorry, Sir. We don't normally tell our customers this, but there is an undocumented DOS command that will fix the problem.
User	:	I knew it!
Tech	:	Just add the line LOAD NOSMOKE.COM at the end of the CONFIG.SYS. Let me know how it goes.
...10 minutes later...
User	:	It didn't work. The power supply is still smoking.
Tech	:	Well, what version of DOS are you using?
User	:	MS-DOS 6.22.
Tech	:	That's your problem there. That version of DOS didn't come with NOSMOKE. Contact Microsoft and ask them for a patch that will give you the file. Let me know how it goes.
...1 hour later...
User	:	I need a new power supply.
Tech	:	How did you come to that conclusion?
User	:	Well, I rang Microsoft and told him all about what you said, and he started asking questions about the make of power supply.
Tech	:	Then what did he say?
User	:	He told me that my power supply isn't compatible with NOSMOKE.