'Batmobile' Breaks Down In Canada -- Caught on Tape!

Batman is SUPPOSED to be a master of all things mechanical -- but last weekend in Toronto, some bat-impostor ruined the Dark Knight's good reputation ... when his replica Batmobile overheated on the side of the road.

Law enforcement tells TMZ, it wasn't the REAL Batman -- though the man's receding hairline bears a striking resemblance to Michael Keaton -- it was some Canadian superfan with a lot of time on his hands.