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For some unknown reason, Pi Day — the annual celebration of the mathematical constant π (pi) — has become a favorite holiday of American football teams during the NFL’s offseason.

Houston Texans celebrate Pi Day with a blueberry-strawberry pie

This year is no exception, with the Houston Texans, Detroit Lions, Pittsburgh Steelers, Chicago Bears, New York Jets, Tennessee Titans, Tampa Bay Buccaneers, Kansas City Chiefs, Green Bay Packers and Denver Broncos all getting in on the fun.

NFL TEAMS CELEBRATE PI DAY