I loved Turbo Prolog.
Creating many cool things: graphical chess problem solver, watching the search process on a VGA screen on a 386 CPU, expert systems, logic analyzers.
But it's been a long time. C became my next new love (Turbo C first), and many years later a plethora of OO languages.
But Prolog still holds a special place. Too bad it really didn't catch on in my professional career.