When grandpa is ready to sing for someone else, only to realize it's all for his birthday

Grandpa Jack was at brunch with his family when everyone started clapping and singing. He was ready to chime in with the choir for the mystery birthday guest of honor, only to realize it was him! Everyone in the restaurant was celebrating his 89th birthday.

Watch this grandfather's reaction when he realized the celebration was all for him in the video above.

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