BOSTON (CBS) – If you see a green balloon in Boston Wednesday – pop it – you’ll get two free Red Sox tickets.

The Sox have scattered 100 balloons across the city with a pair of tickets to an upcoming game inside each one.

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Five of those balloons will have a pair of tickets for the 100th birthday game at Fenway Park this Friday.

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The Sox started the promotion at 7:30 a.m. and will end it at 3:30 p.m.

No more than ten balloons will be out at any one given time, according to the Red Sox.

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Some of the winners have already posted photos on the Red Sox Twitter page.