Indiana Jones and the Temple of Doom ★★★★

A weaker film in some ways than the other two, but the fact that Spielberg counteracted George Lucas' edgier, darker aspects with a goofier silliness, means it has a more highly concentrated tone. It's leaping right out of a comic book with a brightly coloured cover and rough, pulpy, faded and yellowing pages.
It's not without it's flaws, but being a prequel helps it to build the mythology that services the other installments, a more exotic chapter of the series.