MIT Mystery Hunt 2004
Teams were given a plaster skull at the beginning of the hunt. Inside the skull was a map to the coin, and, at some point during the final runaround, teams needed to smash the skull to get through a wall, thus revealing the map. If any team had thought much about the plot points of the movie Time Bandits and decided to smash the skull earlier in the hunt, they would have been able to bypass the entire hunt and win.
No team did this, so Setec had to win the hard way.