BadIdeas are things you JUST SHOULDN'T DO!
Someone told you to 'rm? -rf /'? It's probably a BadIdea.
You found a candy bar on the footpath and want to eat it? Chances are, BadIdea.
You want to see what would happen if you put your finger in your RJ-45? crimper? You guessed it, BadIdea.
You can't be bothered to sort out deps for an RPM you're trying to install and considder adding --force to the command line because someone said it would solve your problems? Generally a BadIdea Mr newbie.
Remember kids, JUST DON'T DO IT!
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