What was the most fun language to learn?

I don't know why people say that Haskell has such a steep learning curve. It's my second functional language (after a quick flirt with Scheme) and it's a blast to learn. Most fun I had since first learning Pascal. Other than Haskell, learning Perl was not that bad and obviously good old Pascal because it was easy to grasp in a matter of minutes.

So what about you, prog?

P.S. I'm curious to see the correlation between fun-to-learn and popularity, especially since, learning a new language is usually one of the most boring tasks for a programmer.

>>1
Learning Common Lisp (my first Lisp) by reading Land of Lisp was really fun, I still haven't really learned the language yet but I'm getting there!