Hayes is also infamous for two events, both involving the NFL championship games in 1966 and 1967, both against the Packers. In the 1966 game, on the last meaningful play of the game, Hayes missed an assignment of blocking linebacker Dave Robinson, which resulted in Don Meredith nearly being sacked by Robinson and as a result throwing a desperation pass into the end zone that was intercepted by Tom Brown. In the 1967 NFL championship, the "Ice Bowl" played on New Year's Eve, 1967, Hayes was alleged to have inadvertently disclosed whether the upcoming play was a pass or run because on running plays he kept his hands inside his pants to keep them warm and the Green Bay defense knew they didn't need to cover him.