Use as kindling, IMO. The worst computer-related book I have ever had the
misfortune to encounter was from the "21 Days" series. It wasn't the
Perl in 21 Days book specifically, but it was so horrifically terrible
that I feel comfortable condemning that one too without looking at it.
We're not just talking here about a book that excels in mediocrity, like
the For Dummies books that present things in suboptimal ways, contain
mistakes, and leave out important information. The "21 Days" book
that I read was MUCH worse than that. It was the "warn others to
stay away" kind of bad. Avoid, avoid, avoid.
Sanity? Oh, yeah, I've got all kinds of sanity. In fact, I've developed whole new kinds of sanity. Why, I've got so much sanity it's driving me crazy.