Amanda Bynes is gonna be pissed when she sees this ... because she just missed out on the best retirement party ever -- in her honor -- complete with a minor league baseball team and FREE CAKE!
Turns out, when Amanda announced her sudden departure from acting last week -- she broke the hearts of her biggest fans ... a Class AA baseball team in Maryland called the Bowie Baysox.
So, to honor their retired hero, the team put together a "Farewell Amanda" blowout ... which included Bynes-themed games -- like "Big Fat Liar" trivia and a "She's the Man" cross-dressing challenge.
They also played clips from movies, made t-shirts, and signs ... but most importantly -- FREE CAKE!!
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