Jon Hamm trolls Cubs fans with retro Cardinals cap

Here's how to have 41,267 people loathe you with one simple move.

Jon Hamm was one of the fortunate few thousand who were able to secure a ticket to the first World Series game at Wrigley Field in 71 years, but he wasn't there for the Cleveland Indians or the Chicago Cubs.

Instead, the former "Mad Men" actor attended Wrigley donning his St. Louis Cardinals cap, the Cubs' hated division rivals:

There was more to the St. Louis native's troll job, though. The logo on his Cardinals cap is near-identical to the emblem used by the team from 1900-1919, according to SportsLogos.net, a subtle jab at the Cubs' last World Series win in 1908.

Oh, and to rub salt in the Wrigley wound, the Cubs lost Game 3 on Friday, 1-0.