On the Programmers Community Blog there's a post (with quite a bit of feedback) that lists twenty controversial opinions about programming and programmers in general that have been proposed over the years.

One of the very first ideas we had for this blog was to convert some of the wonderful gems of the early era of our site, the undisciplined period, to blog posts. Questions that were once enthusiastically received by the community, but no longer fit Programmer’s scope.

The post has the top twenty answers to the "What’s your most controversial programming opinion?" question as proposed on StackOverflow and includes things like:

• Programmers who don’t code in their spare time for fun will never become as good as those that do.
• The only "best practice" you should be using all the time is “Use Your Brain".
• Not all programmers are created equal.
• If you only know one language, no matter how well you know it, you’re not a great programmer.
• Your job is to put yourself out of work.
• Readability is the most important aspect of your code.

Check out the full post for the complete list...and for the 100+ comments that have been added to it by programmers with both agreeable and disagreeable opinions.