Esquire has an amazing story about my favorite "reality" TV show from my youth: The Price is Right. Apparently, a guy guessed perfectly on the showcase, winning both. Oops. The show used the same stuff and prices over and over again, which lead to some people figuring out the patterns, and one guy absolutely nailing it.
Fixed or not fixed? Since this happened in the early days of the Drew Carey era, much suspicion about whether this was done to pump up the ratings. Read the tale and make your own guess. I am not sure, but the guy might be legit with a calculator like mind.