I just started to learn the Factor programming language. I think of it as a modern implementation of a stack based language like Forth (similar what Clojure is for Lisp).

I admit, the first step were a bit brain-twisting, but after getting hands dirty, programming feels relieving. Like a rain shower on a steamy hot day. No worrying about syntax and punctation, elegantly shuffling the stack is fun. For me a perfect demonstration of KISS.