Being in New England, the first thing I thought of is the rare colored lobsters. Here’s a split blue and orange lobster caught in Maine and displayed in Rye, NH, estimated to be a 1 in 50 million find.
There are Halloween lobsters (half orange, half dark brown), albino/white lobsters, all blue lobsters, and cotton candy lobsters (estimated to be a 1 in 100 million find!)
And an iridescent rainbow lobster from Nova Scotia!
An article from 2017 explaining why they’re different colors, and showing other colors:
