Security Stories - funny and not-so-funny

Question

Here we are on the last day of this event.  Lots of good questions and answers.
I don't have anything useful to contribute, so I'll start this thread with a couple of stories illustrating how easy it is to get into trouble on the interwebs. You can have all the security software in the world, but it won't eliminate PEBKAC. I blame a certain community supermod for encouraging this...
1) My wife yelled at me that her computer was messed up.  (It's always my fault)  She couldn't open an email attachment.  I asked her to show me.  It was from a familiar email address, but the contents were in broken English and the attachment was waaay suspicious.  She was just curious to see what it was.
The reason she couldn't open it was that the AV software had popped up a window screaming "do you really, really want to to open this!!!!!"  Fortunately the popup was behind the browser window and she couldn't click "OK".
2) A co-worker complained that his desktop had been running slow for a month or so.  I immediately noticed that the NIC LED was constantly blinking.  Welcome to the botnet.  We started playing 20 questions, and I finally got this out of him:
He had gotten an email - seemingly from corporate HQ (we were briefly owned by a large company) saying something like "Corporate has discovered infections on several machines.  If you find a file "..\windows\system32\something-important.dll" remove it immediately!"  He did.  24 hours later here came another email "Sincere apologies.  The previous email was incorrect, and we should not have asked you to remove that dll.  Please reinstall the attached file."  He did.  Hilarity ensued.
He didn't bother to run this by the IT guy (me, sort of) for a month.
3) A co-worker's spouse was visiting, and asked to use our wifi connection to conduct some of her business.  She needed to contact the mother ship in another state.  Check her email - or so I thought.  After a while, she came into my office and said something like " the IT guy at my office needs the password to your router.  He needs to change your firewall settings so my app will work."  He was running a remote desktop on her machine and had already tried to fiddle the router without asking.
Insane.  Criminally.
Anyone care to add to this?  Or petition the mods to remove it?
Z.
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Answer 1

Good idea, Z.  A bit of levity doesn't detract from learning. 
True story:
On one of the forums I admin, there was someone who was having ongoing problems with his computer.  He was a regular contributor to the forum, although in the general areas, not with computer help.  The problem I encountered with him is that he wouldn't follow through or would avoid answering questions that were directed at determining the nature of the problem.  Instead, he would claim to reinstall the OS and all would be well . . . for a while anyway.
Finally we learned the real reason he had ongoing problems with his computer. 
QUOTE:
"i am CERTAIN it is running hot, b/c, among other things, I cover all the airvents with a TOWEL while it is running!
yeah, i kno this is not ideal, but there are reasons (flying liquids!) why I am afraid to leave it exposed. anyway, i figured this was adding wear and tear to the machine, but i didn't think it was a cause of big problems in the SHORT-term.
HOWEVER, last night i left it uncovered (lid closed but no towel) and pointed a FAN at it. as of this morning (11 hrs or so) it is STILL running w/o a crash!"
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