The Castle of Cagliostro, which features Anime veteran Lupin 3rd and his hilarious crew on an amazing caper - it's not for money, it's not for jewels, but a woman. The film's introduction and music is so explosive and had me howling with laughter from the beginning, and Yuji Ohno's magnificent soundtrack was both a tear jerker and a heart pounding adrenaline rush. Hayao Miyazaki - the biggest name in animation next to Disney and Dreamworks - was the film's director and remained unbelievably faithful to the series, plus this was his first feature length film which would not just shape the entire series (as it was aimed towards adults but this film is family friendly), it would also influence Miyazaki's own works to great lengths.
The film's finale is the reason why I hunted it down for so many years. Lupin and his team get away, but the Princess (the woman he was after) and Inspector Zenigata (whose life mission is to catch Lupin) stand and watch as he drives away. The following dialogue is my favourite in film:
Princess: But why catch him? He saved me from Count Cagliostro!
Zenigata: He stole something more valuable than money....
Zenigata: He stole your heart, and for that I'm going after him! C'MON MEN!
It's a film that has to be seen to believed, and heard to be truly admired. Its music equals the animation and the architecture of Cagliostro, plus the voices and acting are tip-top. I cannot recommend it strongly enough.