Loved Hustle, and how it really captured the essence of that slick 1970s crime caper movie - in keeping, too, with the aesthetic and feel of the series as a whole.
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Was going to say Bojack Horseman, but the first reply beat me to it. God, I love the opening.
I'll throw in another great animated title sequence: Gravity Falls.
Teenage mutant ninja turtles opening from 2003 is a secret pleasure.
The Wire had some great opening sequences, but season 2 is a particular favourite of mine.