Strangest language feature

I know this is going to seem old-fashioned, but I don't think much of using online tutorials to learn programming languages or platforms. These generally give you no more than a little taste of the language. To really learn a language, you need the equivalent of a "book", and in many cases, this means a real dead-tree book.

If you want to learn C, read K&R. If you want to learn C++, read Stroustrup. If you want to learn Lisp/Scheme, read SICP. Etc.

If you're not willing to spend more than $30 and a few hours to learn a language, you probably aren't going to learn it.

Programmers who don't code in their spare time for fun will never become as good as those that do.

I think even the smartest and most talented people will never become truly good programmers unless they treat it as more than a job. Meaning that they do little projects on the side, or just mess with lots of different languages and ideas in their spare time.

(Note: I'm not saying good programmers do nothing else than programming, but they do more than program from 9 to 5)