What is your favourite movie trilogy?

Doesn't look like anyone's thrown in any love for the Ong Bak trilogy, so I will.

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"You seem a decent fellow. I hate to kill you."
"You seem a decent fellow. I hate to die."

I haven't seen that many trilogies to have a favourite one, but, I would consider the "Glaciation" films of Michael Haneke (The Seventh Continent - Benny's Video - 71 Fragments of Chronology of Chance), a fantastic trilogy. I would also say that the "Amsalem" trilogy (To Take a Wife - The Seven Days - Gett) is a good watch as well.

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"A film has to be a dialogue, not a monologue — a dialogue to provoke in the viewer his own thoughts, his own feelings. And if a film is a dialogue, then it’s a good film; if it’s not a dialogue, it’s a bad film."

- Michael "Gloomy Old Fart" Haneke

The Godfather trilogy, though I thought the last one, while not terrible, wasn’t up to the first two. (I also thought Part II had gaping plot holes.)

Lord of the Rings