Maybe I should have been less absolute with best and gone for good. I do have a soft spot for Fight Club though, it's a near-perfect wrap-up as they hold hands and the credit company buildings come down to Where is my mind? And there's a dick, for those paying attention at the back.
Some others, Arrival, where the ending deftly knits together the story threads into a satisfying conclusion, and Momento, which holds together the two facing narratives and neatly arrives back at the start. Sixth Sense, while everyone claims they saw the twist coming, they're lying.
Most modern films struggle with endings because there's always got to be an option for a sequel, and by definition, an ending has to be an ending, not a jumpstarter for the next instalment.