Seinfeld surprise! Jason Alexander makes unexpected appearance on stage at Larry David’s ‘Fish in the Dark’

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Theatergoers got a big Seinfeld surprise last night!

Jason Alexander made an unexpected appearance at Larry David's play "Fish in the Dark."

The show is written by David and follows a family as it deals with the death of a loved one.

Alexander will be taking over the lead role on Tuesday.

Related: Jason Alexander taking over for Larry David in Broadway's "Fish in the Dark"

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