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While all of the clues should clearly relate to the theme once you know what it is, an individual set of clues can have its own, misleading sub-theme; for example, pictures of Shelby Manhaten, C. Montgomery Burns, and Nelson Mintz from "The Simpsons" were the fourth set of clues for the "US Senators" Ultra.
A list of all known Ultra Bonus topics to date can be found here: https://wso.williams.edu/orgs/trivia/ultra.html