Which team started the thing with "rally caps"?

Search: rally caps

Why: I've seen that GM commercial with them a bunch of times. I didn't know what the deal was with the inside-out backwards hats until Zack just told me what they were.

Answer: The first appearance of the Rally Cap was during the 1942 baseball season when fans of the Detroit Tigers wore their baseball caps inside-out to generate comebacks late in games. The superstition spread from the fans to the players themselves, and rose to national awareness during the 1945 World Series when the Detroit Tigers were playing the Chicago Cubs.

It was Game 5; the series was tied 2-2. In the 6th inning, the radio announcer mentioned certain members of the Tigers in the dugout wearing their caps inside out. In that inning, the Tigers scored 4 runs after a ball rolled between the legs of Chicago first baseman Phil Cavarretta. The Tigers then went on to win the game 8-4. The historic rally led to a Game 7 win, allegedly with the prominent assistance of their "Rally Caps" allowing the Tigers to become the 1945 World Series Champions.

Source: Wikipedia

The More You Know: It is said that the Boston Red Sox come-from-behind series wins in the 2004 ALCS and 2007 ALCS have been attributed to manager Terry Francona's tobacco chewing habit, here called the "Rally Chew." However, in 2008 the Red Sox came up short against the Tampa Bay Rays mainly because Francona, in an effort to kick his addiction to tobacco, had resorted to chewing bubble gum instead.