Chachi Arcola
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Chachi Arcola was a character played by Scott Baio on the sitcom Happy Days, and it's spin-off Joanie Loves Chachi. He was a cousin of Fonzie and later dated and married Joanie Cunningham.
Chachi became the drummer for Richie's band. Then he graduated to guitar and lead vocals in his own band, starting in the 1981-82 season.
His catchphrase, "Wah Wah Wah", never caught on.