What happened to Al Pacino? I could try to explain, but I'll let Al do it himself:
His volume-challenged voice, his wild, frozen, hammy expressions... it's more Looney Tunes than... professional acting. Where is "Vincent Hanna" from? What happened to Glengarry Glen Ross? Or... Sea of Love (good lead, complicated movie)? Or even Frankie and Johnnie?
Bonus question: what was Michael Mann thinking? Double bonus: This was the take you went with? Not only is Hank Azaria's "jesus!" too quiet after Pacino's shouting, I think maybe Azaria wasn't just reading his lines.
The tone of this scene is all over the place, and doesn't work for me at all. Even if the dialogue was the point ("women's bodies=awesome" or "you been whipped, dummy"), I've seen other actors do this much, much better. I've never liked Heat, cool action sequences be damned; I remember when I saw it in the theater, and this moment didn't help.