T-Mobile Park rainproof baseball joke

T-Mobile Park, opened in 1999 (formerly Safeco Field), is the home stadium of the Seattle Mariners and features a retractable roof. Because of Seattle's frequent rain, locals commonly joke that the city’s major league baseball stadium was designed so fans can watch games without worrying about the weather. The roof's use during wet conditions and the stadium's history of rain-related scheduling make the joke broadly referenced around baseball season.