My first dev job :

Do a front-end in Joomla!. As an internship. Without being paid.
(In France, if you are here for >2 months, they can pay you, or not.)

At least, now I know why Joomla is a no-no when you want to do custom things. Heard that the team working on back-end had problems of PHP, like the PHP appearing and the one Joomla uses "is not the same" or something like this.

And now you know if you didn't. No problem.