So I am a PHP programmer now. I have dealt with many languages in my life, of which VB.NET was not the worst. But know PHP. Whenever I load perlmonks.org I feel a little bit dirty =)
I was very cautious in the interview, securing that they use a server side framework (Zend) and MVC in general. On day II i learned about the V in their MVC. Instead of using Zend_View (which is *ahemm* fairly powerful), they use a home baked one. The only thing this beast supports is one level deep loops and variable interpolation. When you want something nested you have to render the sub-templates within the controller, add the resulting html as variables to the main template and send that to the browser. Ack!
Now I ask you. What where the biggest 'sins' you have commited in your programmer career for a living? What where the biggest pitfalls you discovered when starting a new job?