Always delete the french language pack!

Way back in the day - back before there were popular things like "wiki" and help forums were mostly people writing their own drivers, a young ReverendDS decided that he was going to get into this "Linux" thing that he'd heard about.
And so, he found the guru at his work and asked the Guru to help him get started.
It was decided that Debian GNU/Linux would be the distro of choice (there really weren't a lot of options back then) and the Guru was going to help me get set up and running.
True, I was under the impression that it would be easy and I'd be able to just run with it.
But dear god was I wrong. The guru helped me out a bunch. We both worked the graveyard shift of a shitty call-center job at the time and loved it because we only answered two calls a night. Which gave us 10 hours to do whatever we wanted. He worked on the video game he was making, I worked on getting Debian functional.
After compiling and getting everything as close to completed as possible, I was having problems with my NIC drivers.
I probably spent a good two weeks trying to resolve it with little hints here and there from my buddy The Guru to point me in the direction of the next bit to fix. It took so long because I couldn't get online, let alone get online at a decent speed.
I must have been seriously annoying him one night because I was bitching about how slow things were running (seriously, even on a 1Mbps port I was getting about 56k speeds) and looking back, I realize I was seriously interfering with his programming.
Finally, he snapped.
Him: "Seriously, just delete the damn French language pack and that should fix the NIC driver issue."
Me: "How do I do that?"
Him: "Just run the command rm -fr / from your root user"
And because I trusted him and because I was learning what to do, not why to do it... I did.
He told me to just let it run. And I did.
And when my computer was completely non-functional, he laughed and told me to "Never, EVER run a command that you don't know what it does and why it does it".
I took that lesson to heart. I haven't run a command that I didn't know since that day. And I use the exact same technique to teach my PFYs the same lesson.
Sure, it's kind of malicious and evil, but backups are your friend and there's nothing more of a learning experience than to completely wreck a box and handle it like a sysadmin.
So, tell your PFYs that they should always delete the French Language pack.
It'll do 'em good.