Long ago and far away there was only one PC implementation for Prolog and like a good little programmer I gave it a shot. It was an 'interesting' ride (interesting in the Chinese sense) but I stuck with it long enough to understand that I was better off building my projects in the languages that Prolog seemed to have been built from. Never looked back; finished the project without further confusion or delay, took that as a sign. Similar to how many on HN seem to feel about Lisp :)