I didn't get it, but it's hilarious.

Rating: 6/10 (16 December 2009)

OK, let me say up front that I come from the older generation of comedies. Dean Martin & Jerry Lewis, When Harry Met Sally, all the way up to & including Airplane. Nacho Libre presents a new & very different style of humour. You don't get big punchlines, witty comebacks or rapid-fire dialogues. If I had to describe it, I'd say it's "deadpan" to an extreme. You really have to key in on subtle signals like facial expressions, odd phrases, or just situational weirdness to understand the jokes.
Not expecting that, I watched this movie all the way through and only laughed twice. I kept waiting for punchlines that never came.
After watching it, I came to the IMDb message board and read through the thread of "Funniest Lines". Sure enough, I didn't get the jokes there either, but seeing how everyone was cracking up, I realized that those lines were funny.
After that, I found myself talking to people in everyday life, quoting Nacho Libre and getting big laughs. Suddenly I think I get it. I'll probably watch this film again, knowing what to expect, and I bet I'll get a few big lols out of it. Maybe even a rofl or 2.